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NOW PLAYING: History of the Snellen Chart

History of the Snellen Chart History of the Snellen Chart 00:22 While the Snellen chart establishes a standard, more efficient methods of vis... More Complete Visual Measurements More Complete Visual Measurements 00:37 The Results of Contrast sensitivity testing better correspond to visual abili... Visual Acuity and CS Testing Visual Acuity and CS Testing 00:46 Visual acuity testing alone does not identify greater than expected contrast ... Unique Vision Testing Unique Vision Testing 01:05 The Functional Vision Analyzer™ provides pictorial displays of vision loss an... Beyond Visual Acuity Beyond Visual Acuity 01:14 CS testing is much more telling than the single number result produced by vis... 20/20 is Not Enough 20/20 is Not Enough 01:12 Contrast sensitivity testing detects the serious loss of vision even those wh...

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Today's standard for vision testing, the Snellen chart, which is the letter chart with black letters on white background, that goes back actually 1862. It was developed in Utrecht, Holland by Dr. Hermann Snellen. So when we were fighting our civil war here in the United States that is when that chart was developed, very old technology.

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