Recent studies have indicated differences due to chromatic imbalances between red-green filters and polarizers when performing stereoaccuracy tasks. The goal of this study is to evaluate the effect of chromatic imbalances on motor fusional ranges through red-green filters and polarizing materials. Targets consisted of a Bernell BC 510 anaglyph and Quoits Circle Vectogram. A slight size difference of 1.4 cm existed between the two targets and was compensated for by the use of a projection system on a ground glass screen. Crossed and uncrossed disparities were presented in a predetermined random order to 20 subjects. Testing consisted of three conditions. To simulate standard testing and training procedures, both targets were presented to subjects in the first condition at 40cm without compensation for size difference. Secondly target to subject distance was kept at 40cm but target size was equalized using the projection system. In the final condition, an intermediate testing distance of 1 meter was used and target size was again equalized. All conditions showed a general trend of increased ranges with crossed and uncrossed disparities with the polarizing materials. Of significance were the uncrossed disparities of the projected 40cm distance (P=.0001, F=4.00) and projected 1 M distance (P=.0001 , F=2.332). In the projected 40cm test distance the average difference between red-green materials and polarizing materials was 5.0 prism diopters. In the case of the projected 1 M target, the average difference was 4.0 prism diopters. Polarizing materials demonstrate greater motor fusional ranges for uncrossed disparities as compared to red-green materials of similar size and form.
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