CA1126555A - Ophthalmic refracting device - Google Patents
Ophthalmic refracting deviceInfo
- Publication number
- CA1126555A CA1126555A CA324,488A CA324488A CA1126555A CA 1126555 A CA1126555 A CA 1126555A CA 324488 A CA324488 A CA 324488A CA 1126555 A CA1126555 A CA 1126555A
- Authority
- CA
- Canada
- Prior art keywords
- bar
- holders
- frame
- fixture
- refracting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 206010002945 Aphakia Diseases 0.000 abstract description 2
- 210000000695 crystalline len Anatomy 0.000 description 43
- 238000000034 method Methods 0.000 description 9
- 238000012937 correction Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 208000014733 refractive error Diseases 0.000 description 4
- 208000010415 Low Vision Diseases 0.000 description 3
- 230000004303 low vision Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 208000002177 Cataract Diseases 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
- A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
- A61B3/04—Trial frames; Sets of lenses for use therewith
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F2009/0035—Devices for immobilising a patient's head with respect to the instrument
- A61F2009/0043—Devices for immobilising a patient's head with respect to the instrument by supporting the instrument on the patient's head, e.g. head bands
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Ophthalmology & Optometry (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Eyeglasses (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
- Eye Examination Apparatus (AREA)
- Prostheses (AREA)
Abstract
OPHTHALMIC REFRACTING DEVICE
ABSTRACT OF THE DISCLOSURE
The specification describes a refracting fixture for use in refracting an aphakic eye over a properly patient fitted spectacles frame glazed with major spherical component lenses and placed in position for use upon the patient. The fixture comprises the combination of a main supporting bar including a pair of tightly juxtaposed wires, a pair of trial lens holders suspended right-angularly from the bar, the holders being individually adjustable along a portion of the length of the bar and in directions across the bar, means for main-taining the right-angular disposition of the holders at all positions of adjustment along and across the bar and means for manually detachably connecting the bar and trial lens holders to a spectacles frame with the holders disposed forwardly of lens supporting rims of the frame.
ABSTRACT OF THE DISCLOSURE
The specification describes a refracting fixture for use in refracting an aphakic eye over a properly patient fitted spectacles frame glazed with major spherical component lenses and placed in position for use upon the patient. The fixture comprises the combination of a main supporting bar including a pair of tightly juxtaposed wires, a pair of trial lens holders suspended right-angularly from the bar, the holders being individually adjustable along a portion of the length of the bar and in directions across the bar, means for main-taining the right-angular disposition of the holders at all positions of adjustment along and across the bar and means for manually detachably connecting the bar and trial lens holders to a spectacles frame with the holders disposed forwardly of lens supporting rims of the frame.
Description
llZt;55~
BAC~CGROU~ID OF THE INVENTION
!
Field of the Invention-This invention relates to ophthalmic xerrac.ing devices and has particular reference to a fixture for ~over refracting~ aphakics.
. .. .... ,. . .' , , Discussion of th'e Pri'or' ~rt After rernoval of the crystalline lens and healing, the eye has the potential for acu~e vision with correction '-of the resultant refractive error. Success of the procedure as ~udged by the patient, however, depends primarily on the accuracy with which the refractive error is corrected.
~est procedures for exploiting an aphakic eye's potential are basically no different from those employed in the working with of any refractive error. However, management of the aphakic differs significantly in the implementation of the refraction findings in a fitted spectacles situation.
~hile unwanted optical errors may'go undetected in low to moderate ophthalmic corrections, those of the "cataract" range of approximately 10 times in amplitude exact significant penalties in lens-eye performance.
Optimal dispensing requires precise knowledge of the orientation of test lenses which during refraction, yield comfort and ~aximum acuity. This may be accornplished with a technique well ~nown and referred to as "over refraction".
.
BAC~CGROU~ID OF THE INVENTION
!
Field of the Invention-This invention relates to ophthalmic xerrac.ing devices and has particular reference to a fixture for ~over refracting~ aphakics.
. .. .... ,. . .' , , Discussion of th'e Pri'or' ~rt After rernoval of the crystalline lens and healing, the eye has the potential for acu~e vision with correction '-of the resultant refractive error. Success of the procedure as ~udged by the patient, however, depends primarily on the accuracy with which the refractive error is corrected.
~est procedures for exploiting an aphakic eye's potential are basically no different from those employed in the working with of any refractive error. However, management of the aphakic differs significantly in the implementation of the refraction findings in a fitted spectacles situation.
~hile unwanted optical errors may'go undetected in low to moderate ophthalmic corrections, those of the "cataract" range of approximately 10 times in amplitude exact significant penalties in lens-eye performance.
Optimal dispensing requires precise knowledge of the orientation of test lenses which during refraction, yield comfort and ~aximum acuity. This may be accornplished with a technique well ~nown and referred to as "over refraction".
.
- 2 - ' ~...
. ''' ' ;' '"'' ~
.. . ; :- . .; ' . -! .
55~-!
Over refraction is practiced with a major spherical component (e.g. a 12 diopter lens) glazed in t~e same or similar frame to ~e dispensed and fitted carerully as if for permanent wear~ By standard refraction ,est procedure, ; additional sphere and cylinder coxrections are determined by placing sphere and cylinder test lens components ~efore the major component. The efficacy of this pro-cedure is a consequence of duplicating in dispensing the orientation which the ma~or spherical component occupied in refraction.
In the practice of over refraction heretofor, a spearate trial lens clip was clamped to each glazed major componcnt fvr supporting the test lens components, i.e. trial lenses. Each clip required separate vertical and horizontal adjustment without means or benefit of referencing with its counterpart. Accordingly, an assurance of accurate similar alignment of trial lenses before the two glazed major components and parallelism with the spectacles frame is lac~ing, notwithstanding the drawbac~s of general ungainliness in having to handle the clips separately rather than as a unit and store the same in a manr.er assuring against their separation and~or mis- -placement of one from another.
In view of parallelism with the spectacles frame and relative alignment of the trial lens holders being critical to the results of over refraction, it is an ohject of this invention to accomplish this in a uniquely simple, inexpensive and cfficient manner.
`
, 112~X5 More particularly, it is another object of the invention to provide an improved "over refraction" fixture which overcomes the problems and drawbacks of prior art trial lens clips.
Still another object is to provide an ophthalmic fixture which has utility in the practice of refracting low to moderate ophthalmic corrections as well as stronger refractive errors of aphakics or other low-vision patients, the fixture rurther having utility with unglazed, as well as glazed patient fitted spectacles frames.
In accordance with the present invention, a pair of trial lens holders are suspended right-angularly from a main support bar. The holders are individually adjustable along a portion of thé length of the bar and in directions across the bar. Means are provided for maintaining the right-angular disposi~ion of the holders at all positions of adjustment along and across the bar. Means are provided for manually detachably connecting the bar and trial lens holders to a spectacles frame with the holders disposed forwardly of lens supporting rims of the frame. The connecting means includes locaters on the fixture for engaging uppermost brow portions of the spectacles frame to establish parallelism of the fixture and frame when the bar and trial lens holders are connected thereto. Clamping arms terminated with V-grooved clampinq block terminally engage portions of the frame below the brow portions to retain the locaters in place against the brow portions when the connection of the bar and trial lens holders is made. The locaters comprise a pair of rollers earriecl by wires extendinq from the main supporting bar and the clamping arms are proximally ~,~
ws/~?,~
,, ' , ,-l~Z~5~
Lixed to the main support bar with respective extensions thereof directed arcuately downwardly away from the bar to the clamping blocks.
Other objects and advantages of the invention will become apparent from the followlng description.
IN THE DRAWINGS
Fig. 1 is a front elevational view of a preferred ~mbodiment of the invention;
Fig. 2 is a side view-of the ophthalmic refracting device of Fig. l;
Fig. 3 is a greatly enlarged fragmentary cross-sectional illustration of a portion of a trial lens holder of the refracting device, the cross-section being taken approximately along lines 3-3 of Fi~
-4a-WS/, ~ t`(.-' , , , , ~X`,tiS55 Fig. 4 is a rear elevational view of the refracting device illustrated in a position of use upon a spectacles frame front;
Fig. 5 is a front elevational view of one trial lens holder co~ponent of the re~racting device with a cylindrical trial lens illustrated in a position of use therein;
Fig. 6 is an elevational view of a spherical trial lens exemplary of the type which may be positioned immeaiately behind the trial lens of ~ig. 5.
Fig. 7 is a front elevational view of a modifica-tion of the invention;
Fig. 8 is a rear elevational view of the refracting 2evice of Fig. 7 illustrated in a position of use upon a spectacles frame front; and Fig. 9 is a side view of the device of Figs. 8 and . , Referring more particularly to the drawings, t~i-illustrated embodiment of the invention comprises trial lens supporting fixture 10 adapted to be clamped to a spectacles frame 12 (Fig. 4). While frame 12 need not be glazed, it will be described hereinafter as having the illustrated major spherical component lenses 14a and 14b over which a final correction needed to co~pensate for a patient's refracting error may be determined with auxiliary trial (test) lenses used in fixture 10.
The structure of fixture 10 includes a normally hori70ntally disposed main supporting bar 16 which, in the form illu.strated, comprises a pair of tightly juxtapositioned wires 18 having end caps 20.
..
5 ~ ' ~
Extending from the central portion of bar 16 in rearwardly spaced relationship therewith are wires 22.
These wires are terminated with grooved rollers 24 (Figs.2 and ~)which are adapted to fit against the u?permost portions o. lens rims or brow portions of the spectacles frame. This establishes parallelism of fixture 10 with frame 120 Spring tensioned clamping arms 26 extend from adjacent the central portion of bar 16 arcuately laterally a~d downwardly to grooved blocks 28 which are pivotally attached to the corresponding free ends of the arms.
As best shown in ~ig. 4, blocks 28 are each rocked into engagement with a portion of the side and bottom of a corresponding spectacles lens ri~m 30 and held thereinplace under the spring tension cf arms 26 which, in turn, locks frame 12 in place against locating rollers 24.
The illustrated section of sheathing 32 on bar lfi merely aesthically conceals soldered or brazed connections which may be used to unite wires 18, 22 and arms 26.
The sheating 32 may, however, comprise a metal ferrule crimped or otherwise tightly fastened to bar 16 so as to itself provide and/or reinforce the aforesàid connections.
Supported by bar 16 are right and left trial lens holders 34a and 34b respectively. These holders, being identical, will be described with reference to details of holder 34a only.
~ iolder 34a comprises an upstanding necX 36 and depending annular portion 38 having a trial lens receiving and supporting pocket 40. Pocket 40 is provided with two semi-circular trial lens comparhnents 42 and 44, the latter disposed immediately forwardly of the former.
~7hile additional compartments may be provided if desired, one compartment 42 suitable for supporting a spherical . . ~ 6 - r trial lens component is usually suf~icient as will become more readily apparent hereinafter. The sphe~ical and cylindrical trial lenses may be reversed in com?artrents 42 and 44, if desired. Opposite sides of each of compartments 42 and 44 are provided with recesses 43 ana 45 respectively (Fig. 2) for permitting a full 180 rotation of a cylindrical trial lens placed in either.
Neck 26 of holder 34a is bifurcated as shown in Figs. 2 and 3 with matching parallel serrations 46 internally of each extension of the ~ifurcation. These serrations 46 extend horizontally across neck 36 and fit snugly over wires 18 of bar 16 as illustrated in Fig. 3. With holder 34a constructed of a rigid but resilient plastic or other lightweight material including lS metal, holder 34a may be adjusted upwardly and downwardly on bar 16 by lifting or lowering the same with sufficient force to cause serrations 46 to override wires-18.
With each increment of one wire 18 diameter, neck 36 will become fixealy snapped into an adjusted vertical position on bar 16. Its vertical right-angular relation-ship with bar 16 will, at the same time, be maintained - by the parallelism of serrations 46. ~older 34a may be readily horizontally slidably adjtlsted along bar 16 while at any vertically adjusted position. A ~rictional 2; force determined by the tightness of serrations 46 against wires 18 prevents accidental horizontal displace-ment of the holder.
. :.....
.....
A spacex 48 of a thickness selected in accordance with the width of the bifurcation in neck 36 is provided to establish the proper frictional fit of neck 36 over wires 18.
~ndecia 50 (Fig. 1~ provide ~eans for indica~ir.
relative positions of vertical adjustment of holde-s 34a and 34b.
Refracting with fixture 12 may be accomplished 2S
follows:
A spectacles frame having a size, shape and style appropriate for a particular low-vision patient, e.g.
zn aphakic, is selected.
For a patient needing a spherical correction other than 12 diopters as is typical for the aphakic, the frame is glazed with 12 diopter spherical lenses and accurately fitted to the patient. It is so adjusted as to locate optical axes of the 12 diopter spherical components in such positions as to extend as accurately as possible through the center of rotation of the eye in each czse of each eye to be re,racted.
Fixture 1~ is applied to the spectacles rame as illustrated in Fig. 4 and the frame is placed upon the patient in a position corresponding to that intended for permanent dispensing.
Annular portions of holders 34a and 34b are adjusted horizontally and vertically into centered relationship with respective optical axes of lenses 14a and 14b.
~7ith the frarne 12 and fixture 10 so positioned and adjusted, refraction procedures are followed to determine the sphere and cylinder ~with axis) which in combination with the 12 diopter major component achieves maximum .. . .
- B - ~
..
visual acuity. Being an over refraction technique, this is accomplished by placing a spherical trial ~test) lens, e.g. lens 52 (Fig. 6), behin~ a cylindrical trial lens 54 (Fig. 5~ in compartments 42 and 44 respectively of poc`;et 40 in each of holders 34a and 34b. As mentioned heretofore, lenses 52 and 54 may be revers~d in pocket 40, if desired.
The powers and cylinder axes of the trial lenses are noied and used in co}nbination with the power of the major spherical component to arrive at the patient's prescription, e.g. for distance viewing correction.
Ne2r-viewing correction may be determined with a plus sphere power trial lens of greater sphere power than the distance trial lens introduced into one of compart~ents 42 and 44. When a patient's working distance is determined, that aspect of the final prescrip-tion ~zy be conventionally computed.
. . _ .
It s-nould be understood that the aforesaid procedure is applicable to either monocular or binocular refraction and that refraction procedures for certain low vision patients may be practiced without the major spherical components 14a and 14b, i.e. with an unglazed spectacles .rz~e 12 and trial lenses only.
P~eferring more particularly to the modification of the invention illustrated by Figs. 7, 8 and 9, fixture lOa witQout the clamping arms 26 of fixture 10 is provided with elastic strap 50 for attaching to a spectacles frame i2a (Fig. 8). Strap S0 is fixed to bar 16 over sheathing 32 with collar button-like fastener 52 held in place by spring clip 54. Fastener 52 protrudes forwardly through clip 54 for receiving a selected one of openings 56 in the free end of strap 50. Remaining-parts of fixture lOa which correspond to similar parts of fixture 10 are given like re~erence numerals and need no further de.~3cription.
5~5 In mounting fixture lOa upon frame 12a, grooved xollers 24 are fitted against brow portion of frame 12a to establish parallelism of frame lOa with frame 12a (Fig. 8). Elastic strap 50 is extended beneath bridge 58 and upwardly over its connection to bar 16 whereupon, with tension applied thereto, it is fixed in place ~y slipping the nearest opening 56 over the forward extension of fastener 52 ~ith fixture lOa so fitted to frame 12a (as shown in Fig. 8), its use for "over refractlon" may ~e practiced as descri~ed hereinabove with reference to fixture 10.
In Fig. 9, there is illustrated a still further modification of the invention which comprises the placement of an annular cushion 60 around the division 62 between recesses 43 and 45 of pocket 40. This cushion, which may be constructed of a flocked fabric, ~elt, velour, synthetic sponge rubber or other such materials, is provided to prevent undue looseness of trial lenses 52 and 54 in compartments 42 and 44 when placed therein. While cushions 60 permit free rotation of one or both of lenses 52 and 54, accidental displacement from compartments 42 and 44 and/or rattling against the compartment walls is avoided.
Those skilled in the art will readily appreciate that there are various modifications and adaptations of the precise form of the invention here shown and described that rnay suit particular requirements. Accordingly, the foregoing illustration is not to be interpreted as restrlctive of the invention beyond that necessitated by the following claims:
-
. ''' ' ;' '"'' ~
.. . ; :- . .; ' . -! .
55~-!
Over refraction is practiced with a major spherical component (e.g. a 12 diopter lens) glazed in t~e same or similar frame to ~e dispensed and fitted carerully as if for permanent wear~ By standard refraction ,est procedure, ; additional sphere and cylinder coxrections are determined by placing sphere and cylinder test lens components ~efore the major component. The efficacy of this pro-cedure is a consequence of duplicating in dispensing the orientation which the ma~or spherical component occupied in refraction.
In the practice of over refraction heretofor, a spearate trial lens clip was clamped to each glazed major componcnt fvr supporting the test lens components, i.e. trial lenses. Each clip required separate vertical and horizontal adjustment without means or benefit of referencing with its counterpart. Accordingly, an assurance of accurate similar alignment of trial lenses before the two glazed major components and parallelism with the spectacles frame is lac~ing, notwithstanding the drawbac~s of general ungainliness in having to handle the clips separately rather than as a unit and store the same in a manr.er assuring against their separation and~or mis- -placement of one from another.
In view of parallelism with the spectacles frame and relative alignment of the trial lens holders being critical to the results of over refraction, it is an ohject of this invention to accomplish this in a uniquely simple, inexpensive and cfficient manner.
`
, 112~X5 More particularly, it is another object of the invention to provide an improved "over refraction" fixture which overcomes the problems and drawbacks of prior art trial lens clips.
Still another object is to provide an ophthalmic fixture which has utility in the practice of refracting low to moderate ophthalmic corrections as well as stronger refractive errors of aphakics or other low-vision patients, the fixture rurther having utility with unglazed, as well as glazed patient fitted spectacles frames.
In accordance with the present invention, a pair of trial lens holders are suspended right-angularly from a main support bar. The holders are individually adjustable along a portion of thé length of the bar and in directions across the bar. Means are provided for maintaining the right-angular disposi~ion of the holders at all positions of adjustment along and across the bar. Means are provided for manually detachably connecting the bar and trial lens holders to a spectacles frame with the holders disposed forwardly of lens supporting rims of the frame. The connecting means includes locaters on the fixture for engaging uppermost brow portions of the spectacles frame to establish parallelism of the fixture and frame when the bar and trial lens holders are connected thereto. Clamping arms terminated with V-grooved clampinq block terminally engage portions of the frame below the brow portions to retain the locaters in place against the brow portions when the connection of the bar and trial lens holders is made. The locaters comprise a pair of rollers earriecl by wires extendinq from the main supporting bar and the clamping arms are proximally ~,~
ws/~?,~
,, ' , ,-l~Z~5~
Lixed to the main support bar with respective extensions thereof directed arcuately downwardly away from the bar to the clamping blocks.
Other objects and advantages of the invention will become apparent from the followlng description.
IN THE DRAWINGS
Fig. 1 is a front elevational view of a preferred ~mbodiment of the invention;
Fig. 2 is a side view-of the ophthalmic refracting device of Fig. l;
Fig. 3 is a greatly enlarged fragmentary cross-sectional illustration of a portion of a trial lens holder of the refracting device, the cross-section being taken approximately along lines 3-3 of Fi~
-4a-WS/, ~ t`(.-' , , , , ~X`,tiS55 Fig. 4 is a rear elevational view of the refracting device illustrated in a position of use upon a spectacles frame front;
Fig. 5 is a front elevational view of one trial lens holder co~ponent of the re~racting device with a cylindrical trial lens illustrated in a position of use therein;
Fig. 6 is an elevational view of a spherical trial lens exemplary of the type which may be positioned immeaiately behind the trial lens of ~ig. 5.
Fig. 7 is a front elevational view of a modifica-tion of the invention;
Fig. 8 is a rear elevational view of the refracting 2evice of Fig. 7 illustrated in a position of use upon a spectacles frame front; and Fig. 9 is a side view of the device of Figs. 8 and . , Referring more particularly to the drawings, t~i-illustrated embodiment of the invention comprises trial lens supporting fixture 10 adapted to be clamped to a spectacles frame 12 (Fig. 4). While frame 12 need not be glazed, it will be described hereinafter as having the illustrated major spherical component lenses 14a and 14b over which a final correction needed to co~pensate for a patient's refracting error may be determined with auxiliary trial (test) lenses used in fixture 10.
The structure of fixture 10 includes a normally hori70ntally disposed main supporting bar 16 which, in the form illu.strated, comprises a pair of tightly juxtapositioned wires 18 having end caps 20.
..
5 ~ ' ~
Extending from the central portion of bar 16 in rearwardly spaced relationship therewith are wires 22.
These wires are terminated with grooved rollers 24 (Figs.2 and ~)which are adapted to fit against the u?permost portions o. lens rims or brow portions of the spectacles frame. This establishes parallelism of fixture 10 with frame 120 Spring tensioned clamping arms 26 extend from adjacent the central portion of bar 16 arcuately laterally a~d downwardly to grooved blocks 28 which are pivotally attached to the corresponding free ends of the arms.
As best shown in ~ig. 4, blocks 28 are each rocked into engagement with a portion of the side and bottom of a corresponding spectacles lens ri~m 30 and held thereinplace under the spring tension cf arms 26 which, in turn, locks frame 12 in place against locating rollers 24.
The illustrated section of sheathing 32 on bar lfi merely aesthically conceals soldered or brazed connections which may be used to unite wires 18, 22 and arms 26.
The sheating 32 may, however, comprise a metal ferrule crimped or otherwise tightly fastened to bar 16 so as to itself provide and/or reinforce the aforesàid connections.
Supported by bar 16 are right and left trial lens holders 34a and 34b respectively. These holders, being identical, will be described with reference to details of holder 34a only.
~ iolder 34a comprises an upstanding necX 36 and depending annular portion 38 having a trial lens receiving and supporting pocket 40. Pocket 40 is provided with two semi-circular trial lens comparhnents 42 and 44, the latter disposed immediately forwardly of the former.
~7hile additional compartments may be provided if desired, one compartment 42 suitable for supporting a spherical . . ~ 6 - r trial lens component is usually suf~icient as will become more readily apparent hereinafter. The sphe~ical and cylindrical trial lenses may be reversed in com?artrents 42 and 44, if desired. Opposite sides of each of compartments 42 and 44 are provided with recesses 43 ana 45 respectively (Fig. 2) for permitting a full 180 rotation of a cylindrical trial lens placed in either.
Neck 26 of holder 34a is bifurcated as shown in Figs. 2 and 3 with matching parallel serrations 46 internally of each extension of the ~ifurcation. These serrations 46 extend horizontally across neck 36 and fit snugly over wires 18 of bar 16 as illustrated in Fig. 3. With holder 34a constructed of a rigid but resilient plastic or other lightweight material including lS metal, holder 34a may be adjusted upwardly and downwardly on bar 16 by lifting or lowering the same with sufficient force to cause serrations 46 to override wires-18.
With each increment of one wire 18 diameter, neck 36 will become fixealy snapped into an adjusted vertical position on bar 16. Its vertical right-angular relation-ship with bar 16 will, at the same time, be maintained - by the parallelism of serrations 46. ~older 34a may be readily horizontally slidably adjtlsted along bar 16 while at any vertically adjusted position. A ~rictional 2; force determined by the tightness of serrations 46 against wires 18 prevents accidental horizontal displace-ment of the holder.
. :.....
.....
A spacex 48 of a thickness selected in accordance with the width of the bifurcation in neck 36 is provided to establish the proper frictional fit of neck 36 over wires 18.
~ndecia 50 (Fig. 1~ provide ~eans for indica~ir.
relative positions of vertical adjustment of holde-s 34a and 34b.
Refracting with fixture 12 may be accomplished 2S
follows:
A spectacles frame having a size, shape and style appropriate for a particular low-vision patient, e.g.
zn aphakic, is selected.
For a patient needing a spherical correction other than 12 diopters as is typical for the aphakic, the frame is glazed with 12 diopter spherical lenses and accurately fitted to the patient. It is so adjusted as to locate optical axes of the 12 diopter spherical components in such positions as to extend as accurately as possible through the center of rotation of the eye in each czse of each eye to be re,racted.
Fixture 1~ is applied to the spectacles rame as illustrated in Fig. 4 and the frame is placed upon the patient in a position corresponding to that intended for permanent dispensing.
Annular portions of holders 34a and 34b are adjusted horizontally and vertically into centered relationship with respective optical axes of lenses 14a and 14b.
~7ith the frarne 12 and fixture 10 so positioned and adjusted, refraction procedures are followed to determine the sphere and cylinder ~with axis) which in combination with the 12 diopter major component achieves maximum .. . .
- B - ~
..
visual acuity. Being an over refraction technique, this is accomplished by placing a spherical trial ~test) lens, e.g. lens 52 (Fig. 6), behin~ a cylindrical trial lens 54 (Fig. 5~ in compartments 42 and 44 respectively of poc`;et 40 in each of holders 34a and 34b. As mentioned heretofore, lenses 52 and 54 may be revers~d in pocket 40, if desired.
The powers and cylinder axes of the trial lenses are noied and used in co}nbination with the power of the major spherical component to arrive at the patient's prescription, e.g. for distance viewing correction.
Ne2r-viewing correction may be determined with a plus sphere power trial lens of greater sphere power than the distance trial lens introduced into one of compart~ents 42 and 44. When a patient's working distance is determined, that aspect of the final prescrip-tion ~zy be conventionally computed.
. . _ .
It s-nould be understood that the aforesaid procedure is applicable to either monocular or binocular refraction and that refraction procedures for certain low vision patients may be practiced without the major spherical components 14a and 14b, i.e. with an unglazed spectacles .rz~e 12 and trial lenses only.
P~eferring more particularly to the modification of the invention illustrated by Figs. 7, 8 and 9, fixture lOa witQout the clamping arms 26 of fixture 10 is provided with elastic strap 50 for attaching to a spectacles frame i2a (Fig. 8). Strap S0 is fixed to bar 16 over sheathing 32 with collar button-like fastener 52 held in place by spring clip 54. Fastener 52 protrudes forwardly through clip 54 for receiving a selected one of openings 56 in the free end of strap 50. Remaining-parts of fixture lOa which correspond to similar parts of fixture 10 are given like re~erence numerals and need no further de.~3cription.
5~5 In mounting fixture lOa upon frame 12a, grooved xollers 24 are fitted against brow portion of frame 12a to establish parallelism of frame lOa with frame 12a (Fig. 8). Elastic strap 50 is extended beneath bridge 58 and upwardly over its connection to bar 16 whereupon, with tension applied thereto, it is fixed in place ~y slipping the nearest opening 56 over the forward extension of fastener 52 ~ith fixture lOa so fitted to frame 12a (as shown in Fig. 8), its use for "over refractlon" may ~e practiced as descri~ed hereinabove with reference to fixture 10.
In Fig. 9, there is illustrated a still further modification of the invention which comprises the placement of an annular cushion 60 around the division 62 between recesses 43 and 45 of pocket 40. This cushion, which may be constructed of a flocked fabric, ~elt, velour, synthetic sponge rubber or other such materials, is provided to prevent undue looseness of trial lenses 52 and 54 in compartments 42 and 44 when placed therein. While cushions 60 permit free rotation of one or both of lenses 52 and 54, accidental displacement from compartments 42 and 44 and/or rattling against the compartment walls is avoided.
Those skilled in the art will readily appreciate that there are various modifications and adaptations of the precise form of the invention here shown and described that rnay suit particular requirements. Accordingly, the foregoing illustration is not to be interpreted as restrlctive of the invention beyond that necessitated by the following claims:
-
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A refracting fixture comprising the combination of:
a main supporting bar;
a pair of trial lens holders suspended right-angularly from said bar, said holders being individually adjustable along a portion of the length of said bar and in directions across said bar, means for maintaining said right-angular disposition of said holders at all positions of adjustment along and across said bar;
means for manually detachably connecting said bar and trial lens holders to a spectacles frame with said holders disposed forwardly of lens supporting rims of said frame, said connecting means including locaters on said fixture for engaging uppermost brow portions of said spectacles frame to establish parallelism of said fixture and frame when said bar and trial lens holders are connected thereto and clamping arms terminated with V-grooved clamping block for terminally engaging portions of said frame below said brow portions to retain said locaters in place against said brow portions when said connection of said bar and trial lens holders is made, said locaters comprising a pair of rollers carried by wires extending from said main supporting bar and said clamping arms being proximally fixed to said main supporting bar with respective extensions thereof directed arcuately downwardly away from said bar to said clamping blocks.
a main supporting bar;
a pair of trial lens holders suspended right-angularly from said bar, said holders being individually adjustable along a portion of the length of said bar and in directions across said bar, means for maintaining said right-angular disposition of said holders at all positions of adjustment along and across said bar;
means for manually detachably connecting said bar and trial lens holders to a spectacles frame with said holders disposed forwardly of lens supporting rims of said frame, said connecting means including locaters on said fixture for engaging uppermost brow portions of said spectacles frame to establish parallelism of said fixture and frame when said bar and trial lens holders are connected thereto and clamping arms terminated with V-grooved clamping block for terminally engaging portions of said frame below said brow portions to retain said locaters in place against said brow portions when said connection of said bar and trial lens holders is made, said locaters comprising a pair of rollers carried by wires extending from said main supporting bar and said clamping arms being proximally fixed to said main supporting bar with respective extensions thereof directed arcuately downwardly away from said bar to said clamping blocks.
2. A refracting fixture according to claim 1 wherein said supporting bar includes a pair of tightly justapositioned (Claim 2 cont'd) wires and said means for maintaining said right angular dis-position of said holders includes a vertically extending bifurcation in each of said holders, opposite sides of which are provided with matching horizontally directed serrations, said serrations being intimately fitted against said wires of said main supporting bar.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US89177478A | 1978-03-30 | 1978-03-30 | |
| US891,774 | 1978-03-30 | ||
| US05/945,168 US4236793A (en) | 1978-09-25 | 1978-09-25 | Ophthalmic refracting device |
| US945,168 | 1978-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1126555A true CA1126555A (en) | 1982-06-29 |
Family
ID=27128990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA324,488A Expired CA1126555A (en) | 1978-03-30 | 1979-03-27 | Ophthalmic refracting device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS54133791A (en) |
| CA (1) | CA1126555A (en) |
| DE (1) | DE2912613C2 (en) |
| FR (1) | FR2422378A1 (en) |
| GB (1) | GB2017966B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6020201U (en) * | 1983-07-18 | 1985-02-12 | 平山 篤 | optometric lens |
| JPS6099902U (en) * | 1983-12-13 | 1985-07-08 | 東京光学機械株式会社 | Simple ophthalmoscope |
| JPS60142836A (en) * | 1984-01-31 | 1985-07-29 | 東京クロ−バ−株式会社 | Test frame for eye examination |
| JPH0315062Y2 (en) * | 1984-11-26 | 1991-04-03 | ||
| JP2006116074A (en) * | 2004-10-21 | 2006-05-11 | Hiroyuki Fujiwara | Hanging device for exhibition |
| FR2916620A1 (en) * | 2007-05-29 | 2008-12-05 | Prismes Sarl | Orthoptic apparatus for examining and treating e.g. heterotropia, has carriage including Berens plastic prism bar retaining units formed of U-clamp branches for ensuring removable assembling of bar on bar holding carriage |
| FR3019459B1 (en) * | 2014-04-08 | 2016-04-22 | Essilor Int | VISUAL COMPENSATION GLASSES AND METHOD FOR SUBJECTIVE REFRACTION OF AN INDIVIDUAL WITH THE SUNGLASSES |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1631559A (en) * | 1922-07-11 | 1927-06-07 | Bausch & Lomb | Ophthalmic test-lens frame |
| US2491312A (en) * | 1948-07-20 | 1949-12-13 | Ferdinand G Henry | Method and apparatus for ophthalmic measurements |
| US2835161A (en) * | 1954-04-30 | 1958-05-20 | Charles E Jack | Optometrical apparatus |
| GB824876A (en) * | 1957-03-14 | 1959-12-09 | Melson Wingate Ltd | Improvements in or relating to trial frames |
| DE1985757U (en) * | 1967-08-11 | 1968-05-22 | Zeiss Carl Fa | TEST GLASSES FOR EXAMINATION AND EXERCISE PURPOSES. |
-
1979
- 1979-03-27 CA CA324,488A patent/CA1126555A/en not_active Expired
- 1979-03-29 FR FR7907900A patent/FR2422378A1/en active Granted
- 1979-03-29 JP JP3632779A patent/JPS54133791A/en active Pending
- 1979-03-29 DE DE19792912613 patent/DE2912613C2/en not_active Expired
- 1979-03-30 GB GB7911123A patent/GB2017966B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2017966B (en) | 1982-07-28 |
| DE2912613A1 (en) | 1979-10-11 |
| GB2017966A (en) | 1979-10-10 |
| DE2912613C2 (en) | 1985-05-30 |
| FR2422378A1 (en) | 1979-11-09 |
| FR2422378B1 (en) | 1985-03-01 |
| JPS54133791A (en) | 1979-10-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |