Effect of binocular variations of Snellen's visual acuity on Titmus stereoacuity.

Thirty normal subjects were tested with the Titmus stereotest varying the binocular Snellen's visual acuity from 20/20 to 20/200. From the 36 possible combinations, a nomogram describing the relationship of binocular variations of Snellen's visual acuity and stereoacuity was constructed. The nomogram provides a useful reference for comparing expected and achieved clinical results of the Titmus stereotest in normal subjects. The effects of various pathologic conditions of the eye on the relationship between Snellen's visual acuity and stereoacuity needs to be studied.