Kaufmann H, Dannheim E
Klin Monbl Augenheilkd. 1976 Sep;169(3):381-3.
A report is given on a test-instrument which enables us to check the following functions: 1. Visual acuity (Line-E-acuity), 2. Binocular vision by Worth-4-dot-test, 3. Optical correction by Red-Green-test. 4. Stereoacuity by Polaroid-test.