Stereo Optical Randot Stereotest S0-002. Condition is "Used". Shipped with USPS Priority Mail. Test can be used on adults and children. The test helps to evaluate the patients depth perception. Adult testing involves 400 to 20 seconds of arc, and pediatric testing involves 400 to 100 seconds of arc. Includes pair of Standard 3-D Viewers and testing booklet/answer key. All in excellent condition.