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Maki Shindo, Yuko Shibata, Nanami Nakayama, Takushi Kawamorita, Hiroshi Uozato; The Effect Of Astigmatic Blur On Stereopsis. Invest. Ophthalmol. Vis. Sci. 2011;52(14):5717.
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To determine the effect of astigmatic blur on stereopsis and whether this is dependent on the axis of the astigmatism at near ( 40 cm ) and distance ( 6 m ) .
Astigmatic blur was induced in fourteen healthy subjects ( mean age; 22.5 years, mean spherical equivalent; - 2.92 D ) using plus cylinder lens ( + 0.5 D to + 3.0D ) for orientation control. Horizontal, vertical, and oblique ( 45 ° × left eye and 45 °× right eye ) astigmatism was induced with three binocular axis steps. Stereopsis was recorded at near and distance using OPTEC 6500 Vision Tester® ( Stereo Optical, Inc. ) .
Stereopsis degraded with increasing astigmatic blur at near and distance. At distance, with-the-rule astigmatism had the least effect ( p < 0.05 ). There were no significant differences between the three orientations at near stereopsis. The effect of astigmatic blur on stereopsis at near is less than that at distance ( p < 0.01 ).
The effect of astigmatic blur on stereopsis depended on the axis of the astigmatism and examination distance.
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