GB1154595A - Improvements in Sight Testing Equipment Primarily for Young Children. - Google Patents

Improvements in Sight Testing Equipment Primarily for Young Children.

Info

Publication number
GB1154595A
GB1154595A GB3769966A GB3769966A GB1154595A GB 1154595 A GB1154595 A GB 1154595A GB 3769966 A GB3769966 A GB 3769966A GB 3769966 A GB3769966 A GB 3769966A GB 1154595 A GB1154595 A GB 1154595A
Authority
GB
United Kingdom
Prior art keywords
cards
sight testing
testing equipment
young children
gaps
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
GB3769966A
Inventor
Allan Withnell
Herbert Edward Wilson
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
Priority to GB3769966A priority Critical patent/GB1154595A/en
Publication of GB1154595A publication Critical patent/GB1154595A/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

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

1,154,595. Sight testing cards. A. WITHNELL and H.E. WILSON. Aug. 16, 1967 [Aug.23, 1966], No.37699/66. Heading G2J. In a set of three cards used for sight testing the cards have respectively one, two or three dark areas, separated by gaps in the last two cases, the overall size of the dark areas (including gaps) being the same for all three cards. The gaps are dimensioned so that at a given distance persons with visual acuity below a certain standard will not be able to distinguish between the cards. The cards may be combined as a single unit, or used separately.
GB3769966A 1966-08-23 1966-08-23 Improvements in Sight Testing Equipment Primarily for Young Children. Expired GB1154595A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3769966A GB1154595A (en) 1966-08-23 1966-08-23 Improvements in Sight Testing Equipment Primarily for Young Children.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3769966A GB1154595A (en) 1966-08-23 1966-08-23 Improvements in Sight Testing Equipment Primarily for Young Children.

Publications (1)

Publication Number Publication Date
GB1154595A true GB1154595A (en) 1969-06-11

Family

ID=10398378

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3769966A Expired GB1154595A (en) 1966-08-23 1966-08-23 Improvements in Sight Testing Equipment Primarily for Young Children.

Country Status (1)

Country Link
GB (1) GB1154595A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0261963A2 (en) * 1986-09-26 1988-03-30 Stereo Optical Company, Inc. Visual acuity test device and method of preparing same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0261963A2 (en) * 1986-09-26 1988-03-30 Stereo Optical Company, Inc. Visual acuity test device and method of preparing same
EP0261963A3 (en) * 1986-09-26 1989-09-06 Stereo Optical Company, Inc. Visual acuity test device and method of preparing same

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