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KMID : 1159320230250030269
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Korean Journal of Vision Science
2023 Volume.25 No. 3 p.269 ~ p.281
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Measurements of Binocular Visual Function and Reading Ability in Induced Aniseikonia
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Kim Kyeong-Dong
Koo Bon-Yeop
Mah Ki-Choong
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Abstract
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Purpose : This study measured the binocular visual function and eye movement with induced aniseikonia. Also, tried to evaluate the reading ability in accordance with aniseikonia magnification.
Methods : A total of 29 subjects (mean age 24.48±3.43 years) of distance binocular unaided or corrected visual acuity 1.0 and without suppression were selected. To induce aniseikonia, 3 and 6% magnification iseikonic lens was applied respectively. Also, horizontal and vertical fusional vergence, vergence facility and stereoacuity were measured at 40 cm. Eye movement and reading ability were measured using an eye tracker.
Results : When 3% aniseikonia was induced, there was no significant difference in fusional vergence, stereoacuity and vergence facility. In addition, there was also no significant difference in all parameters of eye movement and reading ability. However, when 6% aniseikonia was induced, there was significant differences in blur, break and recovery points of the positive (BO) and negative (BI) fusional vergence (p<0.050). In addition, there was also a significant difference in break and recovery points of the vertical fusional vergence and stereoacuity (p<0.050). However, there was no significant difference in vergence facility, all parameters of eye movement and reading ability respectively (p>0.050).
Conclusion : The induced 6% aniseikonia was shown to affect the reduction of horizontal and vertical fusional vergence and stereoacuity, but there was no significant effect on eye movements and reading skills. In follow-up studies, it will be necessary to measure reading ability, including discomfort that can be consciously felt under long-term reading conditions, and investigate eye movement variables and the threshold for induced aniseikonia, which can have a significant impact on reading ability.
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KEYWORD
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Binocular visual function, Eye movement tracking device, Induced aniseikonia, Reading ability, Stereopsis
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