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GB441758A - Improvements in sight-testing cards - Google Patents

Improvements in sight-testing cards

Info

Publication number
GB441758A
GB441758A GB2557835A GB2557835A GB441758A GB 441758 A GB441758 A GB 441758A GB 2557835 A GB2557835 A GB 2557835A GB 2557835 A GB2557835 A GB 2557835A GB 441758 A GB441758 A GB 441758A
Authority
GB
United Kingdom
Prior art keywords
group
sight
eye
groups
series
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
GB2557835A
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.)
KARL SCHUR
Original Assignee
KARL SCHUR
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 KARL SCHUR filed Critical KARL SCHUR
Priority to GB2557835A priority Critical patent/GB441758A/en
Publication of GB441758A publication Critical patent/GB441758A/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
    • A61B3/066—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing light sensitivity, e.g. adaptation; for testing colour vision 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

441,758. Sight - testing apparatus. SCHUR, K., 11, Kreuzstrasse, Memmingen, Germany. Sept. 14, 1935, No. 25578. [Class 97 (i)] A sight - testing card forastigmatism carries a plurality of groups 5...10 of coloured strips, the members of each group being of the same size and the strips in each group differing from each other in colour. The groups are arranged in series of decreasing size either in column as shown or radially. The meridian of the astigmatism of the eye is determined by known methods and the series is placed either parallel or perpendicular to this line by rotation about the pivot 2. The eye is rendered artificially short-sighted and the lens used is changed until the patient can guess correctly the colours in a standard group, e.g. 8. The card is then turned through 90‹ and another lens found for which group 8 is just distinguished. The difference in power of the lenses gives an indication of the power of the cylindrical lens required to correct astigmatism.
GB2557835A 1935-09-14 1935-09-14 Improvements in sight-testing cards Expired GB441758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2557835A GB441758A (en) 1935-09-14 1935-09-14 Improvements in sight-testing cards

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2557835A GB441758A (en) 1935-09-14 1935-09-14 Improvements in sight-testing cards

Publications (1)

Publication Number Publication Date
GB441758A true GB441758A (en) 1936-01-24

Family

ID=10229941

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2557835A Expired GB441758A (en) 1935-09-14 1935-09-14 Improvements in sight-testing cards

Country Status (1)

Country Link
GB (1) GB441758A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453335A (en) * 1943-11-09 1948-11-09 Eastman Kodak Co Color blindness chart for detecting anomalous vision, deuteranopes, protanopes, tritanopes, and monochromats
US2968212A (en) * 1957-08-12 1961-01-17 Joseph A Marano Photochromatic astigmatic slide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453335A (en) * 1943-11-09 1948-11-09 Eastman Kodak Co Color blindness chart for detecting anomalous vision, deuteranopes, protanopes, tritanopes, and monochromats
US2968212A (en) * 1957-08-12 1961-01-17 Joseph A Marano Photochromatic astigmatic slide

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