Modified Hexagon Dot Stereo Test: Precision and Accuracy of Stereopsis

Abstract

In the original version of the hexagon dot stereo test, the par ticipant gives the sign of apparent depth of a central dot with respect to surrounding dots. The present study examined a modified version of the stereo test where two sets of hexagon dots are arranged side by side to measure not the accur acy but the precision of stereopsis. A comparison of the stereo thresholds, precision and accuracy for 30 observers validates the modification to the test. In addition, the results obtained in the present s tudy using a liquid-crystal-display monitor and the anaglyph method were compared with results obtained in a previous study using two oscilloscop es and polarized filters. Pre sumably owing to crosstalk, the stereo acuity determined by t he anaglyph method tended to be lower. However, the results were good enough to demonstrate the efficiency of the anaglyph method for a quick stereo screening test.