Frisby Stereo test from Good-Lite (Formerly Richmond Products, Inc.)

This "natural" Stereotest consists of three test plates(6mm, 3mm, and 1.5mm thick), which permit stereo acuity measurements in a range of 600 - 15 seconds. No special glasses are required. The hidden shape can only be detected if stereopsis is present. Test plates can be presented separately without the risk of the patient learning the correct answer. Large stereo acuity range. Suitable for a wide age range, even young pre-schoolers. A standardized test situation with a measured viewing distance. Good visual acuity is not essential.