The LANG STEREOTEST® is an easy-to-use screening-test designed for early detection of problems with stereoscopic vision in children.A revised version of the LANG STEREOTEST I to diagnose and screen for disorders of stereopsis. This revised version has improved optical and print quality compared to the former version. It contains three random dot stereo objects with different disparities: CAT 1200”, STAR 600” and CAR 400” and has no monocular clues.