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A hand-held retinal projection system as a low-vision aid Mayumi Kaida 1,2 , Jun Maeda 3 , Koji Inoue 2 , Makiko Murasawa 2 , Makoto Yamaguchi 2 , Hajime Nakamura 3 , Hideya Takahashi 4 , Masaru Kobayashi 5 , Eiji Shimizu 6 , Kunihiko Shiraki 2 1Dept of Ophthalmol,Osaka City Kita Hosp 2Dept of Ophthalmol and Vis Sci,Osaka City Univ Grad Sch of Med 3Medical Informatics and Medical Economics,Osaka City Univ Grad Sch of Med 4Dept of Electrical Engineering,Osaka City Univ Grad Sch of Engineering 5Pre-Venture Team,Japan Science and Technology Agency 6Takarazuka Univ of Art and Design pp.437-440
Published Date 2005/4/15
DOI https://doi.org/10.11477/mf.1410100476

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  • Abstract
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 We designed a hand-held retinal projection system as an aid to visually handicapped persons. We compared the system with a face-mounted video display using a closed circuit television system. Thirteen low-vision persons participated in the study. Their ages ranged from 57 to 82 years,average 70 years. Their best corrected visual acuity ranged from 0.01 to 0.3,average 0.04. They were asked to read characters with these two devices for 20 seconds. The correctly read characters were then counted. The size of characters were gradually made smaller,starting from 400 down to 28 point-sizes. The maximum reading speed was almost the same for the two devices. The critical point sizes were smaller with the retinal projection system than with face-mounted video display. The findigns show the feasibility of our new system as a low-vision aid.


Copyright © 2005, 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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