Introduction to Visual Acuity Measurement
A Guide to Vision Testing Tools
Selecting Methods and Diagnostic Instruments for Accurate Clinical Assessment
Since the 1970s, Precision Vision has built a reputation of producing the most accurate and most durable vision testing tools available. In the 1980s, they printed the first ETDRS cards and produced the standard ETDRS illuminator cabinet. Since the early 1990s, they have carried a variety of Low Vision and pediatric testing tools.
This introduction is meant to provide some guidance in selecting from the vast array of charts and devices available. It is divided into several specialized sections designed to maximize diagnostic precision.
Guide Sections & Classifications
Reference Context
A more detailed and comprehensive academic discussion is available via the Smith-Kettlewell Eye Research Institute archives.
Measuring Vision and Vision Loss, A. Colenbrander, in: Duane’s Clinical Ophthalmology, Vol 5, Ch. 51, ed. 2001 and later.
View Historical Text External Link
Access the Complete Technical Manual
Click below to review the full, comprehensive manual details on operational testing parameters, chart calibrations, and structural distance parameters.
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