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GB207501A - Improvements in or relating to apparatus for the examination of the keenness of vision and the chromatic sense - Google Patents

Improvements in or relating to apparatus for the examination of the keenness of vision and the chromatic sense

Info

Publication number
GB207501A
GB207501A GB22023/23A GB2202323A GB207501A GB 207501 A GB207501 A GB 207501A GB 22023/23 A GB22023/23 A GB 22023/23A GB 2202323 A GB2202323 A GB 2202323A GB 207501 A GB207501 A GB 207501A
Authority
GB
United Kingdom
Prior art keywords
casing
testing
vision
disc
sense
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
GB22023/23A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB207501A publication Critical patent/GB207501A/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
    • A61B3/06—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing light sensitivity, e.g. adaptation; for testing colour vision

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

207,501. GuÚrin, E. Nov. 22, 1922, [Convention date]. Sight - testing apparatus for testing acuity of vision and the chromatic sense comprises a source of light 2 enclosed in a casing 1, the casing 1 being capable of rotation about the light, and having a translucent ribbon 9 on rollers at one end for testing acuity of vision and a disc 6 at the other end for testing the chromatic sense. The apparatus is normally housed in a casing 39 and is supported on a base 40 fitted with stops 41 which fit the casing 39 when the same is used as a stand during testing operations. The translucent ribbon 9 is provided with charts of type of graduated sizes consisting of letters or outlines so that test mav be made of both educated and illiterate persons. When using the colour sense testing disc 6, the casing 1 is rotated through 180‹ and various colour screens, signals, semaphores &c. which are on the disc 6 may be brought into position before an aperture 46 in the casing 1. The light 2 may be varied in conjunction with comparison photometers so that tests may be carried out at various and definite luminosities.
GB22023/23A 1922-11-22 1923-08-31 Improvements in or relating to apparatus for the examination of the keenness of vision and the chromatic sense Expired GB207501A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR207501X 1922-11-22

Publications (1)

Publication Number Publication Date
GB207501A true GB207501A (en) 1924-03-13

Family

ID=8880501

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22023/23A Expired GB207501A (en) 1922-11-22 1923-08-31 Improvements in or relating to apparatus for the examination of the keenness of vision and the chromatic sense

Country Status (1)

Country Link
GB (1) GB207501A (en)

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