http://www.stereooptical.com//video/player/12539-history-of-the-snellen-chart History of the Snellen Chart While the Snellen chart establishes a standard, more efficient methods of vision testing have since been developed. 22 http://d24y9904fwusha.cloudfront.net/public/assets/flash/11927/c1_v1.flv http://d24y9904fwusha.cloudfront.net/public/assets/image/12299/c1_v1.jpg http://www.stereooptical.com//video/player/12542-more-complete-visual-measurements More Complete Visual Measurements The Results of Contrast sensitivity testing better correspond to visual abilities than does the Snellen chart. 37 http://d24y9904fwusha.cloudfront.net/public/assets/flash/11930/c1_v2.flv http://d24y9904fwusha.cloudfront.net/public/assets/image/12302/c1_v2.jpg http://www.stereooptical.com//video/player/12545-visual-acuity-and-cs-testing Visual Acuity and CS Testing Visual acuity testing alone does not identify greater than expected contrast sensitivity reductions. 46 http://d24y9904fwusha.cloudfront.net/public/assets/flash/11933/c1_v3.flv http://d24y9904fwusha.cloudfront.net/public/assets/image/12305/c1_v3.jpg http://www.stereooptical.com//video/player/12548-unique-vision-testing Unique Vision Testing The Functional Vision Analyzer™ provides pictorial displays of vision loss and meets testing guidelines. 65 http://d24y9904fwusha.cloudfront.net/public/assets/flash/11936/c1_v5.flv http://d24y9904fwusha.cloudfront.net/public/assets/image/12308/c1_v5.jpg http://www.stereooptical.com//video/player/12551-beyond-visual-acuity Beyond Visual Acuity CS testing is much more telling than the single number result produced by visual acuity testing. 74 http://d24y9904fwusha.cloudfront.net/public/assets/flash/11939/c1_v6.flv http://d24y9904fwusha.cloudfront.net/public/assets/image/12311/c1_v6.jpg http://www.stereooptical.com//video/player/12554-2020-is-not-enough 20/20 is Not Enough Contrast sensitivity testing detects the serious loss of vision even those whose visual acuity is 20/20 can experience. 72 http://d24y9904fwusha.cloudfront.net/public/assets/flash/11942/c1_v7.flv http://d24y9904fwusha.cloudfront.net/public/assets/image/12314/c1_v7.jpg