Stereoscopic Slides (yellow binding)
A gross qualitative stereopsis assessment can be obtained using two images of the same object, hypothetically taken from slightly different angles, to indicate depth perception. The slides are inserted into the slide holders with controls of each slide positioned towards or away from the subject. The patient is then required to describe the apparent effect (i.e. a swing moving towards or away from them). The test should be repeated, with the slide controls changing position, to ensure the stereoscopic effect is authentic and the patient is not guessing.