The Vimetrics CVA is an interactive computer device that measures threshold visual acuity by presenting a Landolt-C with the gap randomly tumbled in one of 4 positions to which the patient responds with a response pad. The threshold is approached in a logarithmic, staircase fashion to define the test subject's acuity threshold with a resolution similar to letter by letter scoring in chart testing but with the ability to rapidly test under a number of conditions of luminance and contrast that simulate activities of daily living.