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Test types in visual acuity determination.:Report 1. Visual acuity-brightness relation in various Shapes of test types Sukeyuki Oshima 1 , Tatsuo Enomoto 1 , Shigeru Shinoda 1 1Dept. of Ophthalmology, Tokyo Medical and Dental Univ. pp.143-148
Published Date 1962/2/15
DOI https://doi.org/10.11477/mf.1410202431
  • Abstract
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An attempt was made to find out the best shape of the test object which gives the clo-sest values visual acuity of to Landolt's rings.

Photographs of Landolt's rings, Inoue's hooks:(reduced type of Snellen's hooks), Yamamori's 6-6 rings and Hagino's 4-dots-types were used. A series of test objects was made for each of the object, the size and the albedo being varied serially : the ratio of albedos of the test object and the surrounding field was kept constant.

The acuity-brightness relations were obtained for each series of the object using a uniform illumination.


Copyright © 1962, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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