Sight Testing and Refraction

Colour Vision and Stereo Tests | Lang Stereo Test No. 2

Lang Stereo Test No. 2

Lang stereo test No. 2

Lang Stereo Test No. 2

  • The Lang Stereotest was created to simplify stereopsis screening in children. It is based on two principles: random dots and cylindrical gratings.
  • In binocular vision stereoscopic shapes are recognized.
  • Lang Stereotest II measures disparities: Moon and Star are 200, car 400 and elephant 600 seconds of arc plus monocularly visible star.
  • In the new Lang II test, the random dots are smaller and less dense.
  • This disparity is finer, namely 200 seconds of arc for the moon and the star, 400 for the car, and 600 for the elephant when viewed at a distance of 40cm.