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KMID : 1011420230280030199
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Journal of Korean Ophthalmic Optics Society
2023 Volume.28 No. 3 p.199 ~ p.207
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Effect of Astigmatism Axis Alignment Error Direction on Distance and Near Visual Acuity and Near Static Stereopsis
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Kim Gi-Chang
Jung Su-A
Kim Hyun-Jung
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Abstract
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Purpose : This study aimed to investigate the effect of astigmatism axis alignment error direction on distance and near visual acuity and static stereopsis under identical axis alignment errors.
Methods : Twenty-four adult men and women (22.16±1.95 years) with astigmatism were selected as subjects. Distance and near visual acuity and near static stereopsis were measured under full correction. To investigate the effect of the astigmatism axis alignment error direction on visual function under the same amount of axis alignment error, axis alignment error type - specifically, the binocular astigmatism axis alignment error direction - was set to CCW-CCW, CW-CW, CCW-CW, CW-CCW (CCW: counterclockwise, CW: clockwise). The relative distance and near visual acuity and near static stereopsis were then measured and compared for each combination of error type and amount of axis alignment error when set to 1, 3, 5, and 10°.
Results : Under astigmatism axis alignment error, both distance and near visual acuity and stereopsis tended to decrease. Even for the same amount of axis alignment error, the degree of visual acuity and stereopsis deterioration differed depending on axis alignment error type. Visual acuity and stereopsis were decreased relatively less in CCW-CW and CW-CCW, in which axis alignment error of both eyes occurred in the opposite direction. However visual acuity and stereopsis decreased significantly in CCW-CCW and CW-CW in which axis alignment error of both eyes occurred in the same direction.
Conclusions : Those with astigmatism may show differing degrees of deterioration of visual acuity and stereopsis depending on the axis alignment error direction, even if the amount of axis alignment error is the same. Therefore, this should be considered when prescribing and dispensing eyeglasses.
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KEYWORD
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Astigmatism, Astigmatism axis, Axis alignment error, Axis alignment error direction, Undercorrected astigmatism
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