Comparison Of Fixation Disparity Parameters With The Sheedy Disparometer And The Saladin Fixation Disparity Cards.

Fixation disparity curves were obtained from the 25 subjects with the Sheedy Disparometer, the standard Saladin fixation disparity card, and the modified Saladin fixation disparity card. Although there were no big differences in the xintercepts from the three fixation disparity devices, the y-intercepts were shifted more in the eso direction with the Sheedy Disparometer compared to the Saladin fixation disparity cards. The slopes with the Sheedy Disparometer were steeper than the slopes measured from the Saladin cards. The distribution of curve types was also different with the three different instruments; Therefore, an isolate standard must be applied to each fixation disparity measurement module.