使用闭路电视时放大倍数和视野对阅读速度的影响。

Effect of magnification and field of view on reading speed using a CCTV.

作者信息

Lovie-Kitchin J E, Woo G C

机构信息

Department of Optometry, Queensland Institute of Technology, Brisbane, Australia.

出版信息

Ophthalmic Physiol Opt. 1988;8(2):139-45. doi: 10.1111/j.1475-1313.1988.tb01029.x.

DOI:10.1111/j.1475-1313.1988.tb01029.x

PMID:3264899

Abstract

Reading speeds were measured in 18 subjects with normal vision and 10 with low vision for each of 20 experimental conditions with different magnifications and field sizes on the Closed Circuit Television System (CCTV). There was a significant difference between the results for the two groups of subjects. These results suggested that in low-vision patients with faster reading speeds, minimum magnification for maximum field size on the CCTV would be valid advice. For low-vision patients who read more slowly, reading speed may improve at higher magnifications despite reduced field size.

摘要

在闭路电视系统（CCTV）上，针对20种具有不同放大倍数和视野大小的实验条件，分别测量了18名视力正常的受试者和10名视力低下的受试者的阅读速度。两组受试者的结果存在显著差异。这些结果表明，对于阅读速度较快的低视力患者，在CCTV上使用最大视野尺寸的最小放大倍数是有效的建议。对于阅读速度较慢的低视力患者，尽管视野尺寸减小，但在较高放大倍数下阅读速度可能会提高。