12554 20/20 is Not Enough Contrast sensitivity testing detects the serious loss of vision even those whose visual acuity is 20/20 can experience. Contrast sensitivity testing detects the serious loss of vision even those whose visual acuity is 20/20 can experience. 01:12 72 http://s3.amazonaws.com/eiivideo/public/assets/image/12314/c1_v7.jpg http://s3.amazonaws.com/eiivideo/public/assets/flash/11942/c1_v7.flv http://stereooptical.einsteinapps.com/video/player/12554-2020-is-not-enough