GB605266A - Improvements in devices for testing eyesight - Google Patents
Improvements in devices for testing eyesightInfo
- Publication number
- GB605266A GB605266A GB1501945A GB1501945A GB605266A GB 605266 A GB605266 A GB 605266A GB 1501945 A GB1501945 A GB 1501945A GB 1501945 A GB1501945 A GB 1501945A GB 605266 A GB605266 A GB 605266A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bowl
- annular band
- spherical
- cylindrical
- frame
- 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
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
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)
- Testing Of Optical Devices Or Fibers (AREA)
- Eyeglasses (AREA)
Abstract
605,266. Sight-testing devices. HEALY, J. R. June 6, 1945, No. 15019. [Class 97 (i)] The device comprises two annular bands of transparent material having several lens sections thereon which on one side are each formed with spherical surfaces and on the other side with cylindrical surfaces of progressively varying radii, the bands being mounted with their axes orthogonal and one within the other with their spherical surfaces adjacent so that each may be rotated about its own axis to bring together two overlapping lens sections which can be presented like a spectacle lens before the eye to be tested. As shown a bowl 12, which is a minor segment of a sphere, has formed thereon an annular band 13, the inner surface of which is spherical while the outer surface thereof is cylindrical and has a curvature varying in steps. Within the bowl 12 and disposed with its axis orthogonal thereto'is a similar bowl 14 having an annular band 15, the outer surface of which is spherical while the inner cylindrical surface has a curvature varying in steps. At the pole or each bowl is a spindle, mounted in bearings in a frame 16, so that each bowl may be rotated about its own axis ; this frame may be provided with a pointer co-operating with an index on the annular band to indicate the focal powers of the lens sections in front of the eye. The frame may also be provided with scales and be rotatable about the line of sight so that a cylindrical connection may be determined when necessary. Each bowl and annular band may be formed from plastic material such as polymethyl methacrylate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1501945A GB605266A (en) | 1945-06-06 | 1945-06-06 | Improvements in devices for testing eyesight |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1501945A GB605266A (en) | 1945-06-06 | 1945-06-06 | Improvements in devices for testing eyesight |
Publications (1)
Publication Number | Publication Date |
---|---|
GB605266A true GB605266A (en) | 1948-07-20 |
Family
ID=10051633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1501945A Expired GB605266A (en) | 1945-06-06 | 1945-06-06 | Improvements in devices for testing eyesight |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB605266A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0143151A2 (en) * | 1980-08-11 | 1985-06-05 | BAUSCH & LOMB INCORPORATED | Apparatus for use in an ophthalmic instrument |
EP2363058A1 (en) * | 2010-02-10 | 2011-09-07 | Carl Zeiss Vision, Inc. | Method and apparatus for subjective refraction |
-
1945
- 1945-06-06 GB GB1501945A patent/GB605266A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0143151A2 (en) * | 1980-08-11 | 1985-06-05 | BAUSCH & LOMB INCORPORATED | Apparatus for use in an ophthalmic instrument |
EP0143151A3 (en) * | 1980-08-11 | 1985-07-10 | BAUSCH & LOMB INCORPORATED | Apparatus for use in an ophthalmic instrument |
EP2363058A1 (en) * | 2010-02-10 | 2011-09-07 | Carl Zeiss Vision, Inc. | Method and apparatus for subjective refraction |
US8226238B2 (en) | 2010-02-10 | 2012-07-24 | Carl Zeiss Vision Inc. | Method and apparatus for subjective refraction |
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