GB665531A - Improvements in or relating to ophthalmoscopes and like instruments for inspecting the fundus of the eye - Google Patents

Improvements in or relating to ophthalmoscopes and like instruments for inspecting the fundus of the eye

Info

Publication number
GB665531A
GB665531A GB2427549A GB2427549A GB665531A GB 665531 A GB665531 A GB 665531A GB 2427549 A GB2427549 A GB 2427549A GB 2427549 A GB2427549 A GB 2427549A GB 665531 A GB665531 A GB 665531A
Authority
GB
United Kingdom
Prior art keywords
eye
graticule
mirror
tube
patient
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
Application number
GB2427549A
Inventor
Charles Henry Keeler
Harold Horace Hopkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KEELER OPTICAL PRODUCTS Ltd
Original Assignee
KEELER OPTICAL PRODUCTS Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KEELER OPTICAL PRODUCTS Ltd filed Critical KEELER OPTICAL PRODUCTS Ltd
Priority to GB2427549A priority Critical patent/GB665531A/en
Publication of GB665531A publication Critical patent/GB665531A/en
Expired legal-status Critical Current

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
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
    • A61B3/1208—Multiple lens hand-held instruments

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)
  • Eye Examination Apparatus (AREA)

Abstract

665,531. Sight-testing apparatus. KEELER OPTICAL PRODUCTS, Ltd., and KEELER, C. H. Sept. 21, 1950 [Sept. 21, 1949], No. 24275/49. Class 97 (i). In a hand opthalmascope comprising a handle carrying a source of light throwing a beam on to a mirror which deflects it into the patient's eye, some of the light reflected by the fundus of which is transmitted by or past the mirror to the observer's eye, an objective is provided fixed so that its back focal point is disposed upon the mirror, and a graticule is movable between the light source and the objective whereby an image of the graticule is focused upon the fundus of the patient's eye. As shown in Fig. 5, the arrangement is such that the movable graticule 40 is illuminated by parallel light 47 from a light source 13 and condenser 14 and an image of the graticule is formed on the retina 52 of the patient's eye by an objective 44, a mirror 18 and the lens of the patient's eye, the image being observed through an aperture in the mirror 18. The rear focal point of the objective 44, at which an image of the source 13 is focused, is located on the mirror 18 and coincides with the front focal point of the eye 51. The embodiment shown in Fig. 2 comprises a. tube 22 carrying the source 13 and also supporting a housing member 23 carrying the condenser 14 and slidably supporting a tube 27 having a. graticule 37 fixed to the upper end thereof. The tube slides in guides fixed to a member 15 carried by the housing which member supports the objective 44 and a housing 17 carrying the mirror 18. An aperture 16 in the member 15 permits viewing of the patient's eye and a system of lenses, not shown, may be moved before the aperture 16 by a knob 21. A second graticule 40 is carried by a cylindrical member 38 removably carried by the upper end of the tube 27 to permit of substitution of the graticules. The tube 27 is moved by a knob 31 sliding in a slot 32 in the tube 22 and carries a transparent scale 60 illuminated indirectly by the lamp 13 and viewed through a tube 62 against an index on a plate 65. The scale 60 is calibrated to give the power of spectacle lens necessary to correct the patient's vision when the graticule has been adjusted to bring its image focus on the retina. Specification 333,925, [Class 97 (i)], is referred to.
GB2427549A 1949-09-21 1949-09-21 Improvements in or relating to ophthalmoscopes and like instruments for inspecting the fundus of the eye Expired GB665531A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2427549A GB665531A (en) 1949-09-21 1949-09-21 Improvements in or relating to ophthalmoscopes and like instruments for inspecting the fundus of the eye

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2427549A GB665531A (en) 1949-09-21 1949-09-21 Improvements in or relating to ophthalmoscopes and like instruments for inspecting the fundus of the eye

Publications (1)

Publication Number Publication Date
GB665531A true GB665531A (en) 1952-01-23

Family

ID=10209157

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2427549A Expired GB665531A (en) 1949-09-21 1949-09-21 Improvements in or relating to ophthalmoscopes and like instruments for inspecting the fundus of the eye

Country Status (1)

Country Link
GB (1) GB665531A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125576A (en) * 1982-08-16 1984-03-07 Welch Allyn Inc Optical system for illuminated viewing instruments
EP1652469A3 (en) * 2004-10-27 2006-06-07 Kowa Company Ltd. Ophthalmological measuring apparatus
GB2499650A (en) * 2012-02-24 2013-08-28 Keeler Ltd Ophthalmic instrument with graticule
WO2022208551A1 (en) * 2021-03-31 2022-10-06 Council Of Scientific And Industrial Research (An Indian Registered Body Incorporated Under The Regn. Of Soc. Act (Act Xxi Of 1860)) A device and method for positioning the binocular head of a surgical microscope

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125576A (en) * 1982-08-16 1984-03-07 Welch Allyn Inc Optical system for illuminated viewing instruments
EP1652469A3 (en) * 2004-10-27 2006-06-07 Kowa Company Ltd. Ophthalmological measuring apparatus
GB2499650A (en) * 2012-02-24 2013-08-28 Keeler Ltd Ophthalmic instrument with graticule
GB2499650B (en) * 2012-02-24 2018-04-25 Keeler Ltd Ophthalmic instrument
WO2022208551A1 (en) * 2021-03-31 2022-10-06 Council Of Scientific And Industrial Research (An Indian Registered Body Incorporated Under The Regn. Of Soc. Act (Act Xxi Of 1860)) A device and method for positioning the binocular head of a surgical microscope

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