Introduction to Visual Acuity Measurement

by August Colenbrander, MD – San Francisco

Since the 1970’s Precision Vision has built a reputation of producing the most accurate and most durable vision testing tools available.  In the 1980’s they printed the first ETDRS cards and produced the standard ETDRS illuminator cabinet.  Since the early 1990’s 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 sections. Click on a selection below to get started.

A – Visual acuity
B – Letter chart measurements
C – Near Vision and Reading 
D – Contrast Sensitivity
E – Low Vision tests
F – Pediatric tests

A more detailed discussion is available in:Measuring Vision and Vision Loss, A. Colenbrander,
in: Duane’s Clinical Ophthalmology, Vol 5, Ch. 51, ed. 2001 and later.