GB682350A - Vision testing device - Google Patents

Vision testing device

Info

Publication number
GB682350A
GB682350A GB1882950A GB1882950A GB682350A GB 682350 A GB682350 A GB 682350A GB 1882950 A GB1882950 A GB 1882950A GB 1882950 A GB1882950 A GB 1882950A GB 682350 A GB682350 A GB 682350A
Authority
GB
United Kingdom
Prior art keywords
letters
light
polarized
symbols
reflected
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
GB1882950A
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.)
EDGAR BERNARD WILMUT
Original Assignee
EDGAR BERNARD WILMUT
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 EDGAR BERNARD WILMUT filed Critical EDGAR BERNARD WILMUT
Priority to GB1882950A priority Critical patent/GB682350A/en
Publication of GB682350A publication Critical patent/GB682350A/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
    • A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
    • A61B3/08—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing binocular or stereoscopic vision, e.g. strabismus

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

682,350. Sight-testing apparatus. WILMUT, E. B. July 9, 1951 [July 27, 1950], No. 18829/50. Class 97 (i). Sight-testing apparatus comprises an illuminated object from one or more letters or symbols on a part or parts of which is transmitted or reflected through a polarizer light which is polarized in a plane at right angles to light from one or more other letters or symbols on another part or parts of the object and passing through another polarizer, and two polarizing screens in the path of the polarized light so arranged that the patient sees with one eye letters or symbols from which light polarized in one plane is transmitted or reflected and with the other eye letters or symbols from which light polarized in the other plane is transmitted or reflected, at least a part of the remainder of the object transmitting or reflecting light which is not polarized and is seen by both eyes to form a fusion lock. The apparatus shown comprises a transparent or translucent sheet A bearing letters F, L over which are superposed complementary polarizers B, C. The sheet is illuminated from the rear and is blacked out except for the letters and a narrow band E, the latter forming a fusion lock for a patient who views the sheet through complementary polarizers G, H in a carrier F. In another form, the object is in the form of letters on a reflecting chart disposed a short distance behind a glass plate which is in the form of two sheets carrying between them the polarizing letters B, C.
GB1882950A 1950-07-27 1950-07-27 Vision testing device Expired GB682350A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1882950A GB682350A (en) 1950-07-27 1950-07-27 Vision testing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1882950A GB682350A (en) 1950-07-27 1950-07-27 Vision testing device

Publications (1)

Publication Number Publication Date
GB682350A true GB682350A (en) 1952-11-05

Family

ID=10119127

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1882950A Expired GB682350A (en) 1950-07-27 1950-07-27 Vision testing device

Country Status (1)

Country Link
GB (1) GB682350A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748764A (en) * 1953-01-02 1956-06-05 American Optical Corp Visual training devices
EP0060986A1 (en) * 1981-02-20 1982-09-29 Firma Carl Zeiss Acuity target for testing the binocular reading capability
GB2281634A (en) * 1993-06-17 1995-03-08 Shapiro Isaac J Testing binocular vision
EP1444946A1 (en) * 2001-11-15 2004-08-11 Kabushiki Kaisha TOPCON Ophthalmologic apparatus and ophthalmologic chart

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748764A (en) * 1953-01-02 1956-06-05 American Optical Corp Visual training devices
EP0060986A1 (en) * 1981-02-20 1982-09-29 Firma Carl Zeiss Acuity target for testing the binocular reading capability
GB2281634A (en) * 1993-06-17 1995-03-08 Shapiro Isaac J Testing binocular vision
GB2281634B (en) * 1993-06-17 1996-04-10 Shapiro Isaac J Testing binocular vision using a chart and optical septum
EP1444946A1 (en) * 2001-11-15 2004-08-11 Kabushiki Kaisha TOPCON Ophthalmologic apparatus and ophthalmologic chart
EP1444946A4 (en) * 2001-11-15 2008-12-10 Topcon Corp Ophthalmologic apparatus and ophthalmologic chart

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