Stereo vision is a term used to identify how each eye sees an object at a slightly different angle, yet both eyes work together to give us a three dimensional effect. Stereo vision can be tested using different types of charts, including this Random Dot E test. This test involves the patient wearing stereo glasses (to prevent guessing) and identifying the stereo or "raised" letter E. The patient is also asked to identify the non-stereo dot or target. This helps to identify problems such as Amblyopia and Strabismus in child patients. Designed specifically for use with small children. Patient is asked to distinguish between raised E and non-stereo target. Great for the detection of Amblyopia and Strabismus. Includes: Raised E target, non-stereo target, demonstrator and stereo glasses.