Normal Distance Stereoacuity by Age Assessed by the Frisby Davis Distance Stereotest

Abstract

Purpose: To determine the range of normal distance stereoacuity in populations with normal vision and the change of distance stereoacuity with age using the Frisby Davis Distance (FD2) stereotest and to evaluate the influence of monocular cues on the FD2 test. Methods: Ninety-eight subjects between 4 and 73 years old who had no ocular or neurologic diseases were examined. Distance stereoacuity was measured binocularly and monocularly with the FD2 test. Results: According to the results of the FD2 test, the mean distance stereoacuity of patients was 14.74±6.02 sec of arc. The monocular threshold with the dominant eye was 182.09±58.13 sec of arc. Subjects between 21 and 30 years old showed the best distance stereoacuity of 10.67±3.20 sec of arc. A significant decline in distance stereoacuity and monocular threshold were seen in subjects older than 61 (p