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KMID : 1011420190240040427
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Journal of Korean Ophthalmic Optics Society
2019 Volume.24 No. 4 p.427 ~ p.431
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A Study on Stereoacuity, Distance Horizontal Phoria accordingto Dynamic Visual Acuity
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Kim Tae-Hong
Kim Ha-Rim
Jeong Ju-Hyun
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Abstract
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Purpose: The purpose of this study was to measure the dynamic visual acuity (DVA) and investigate the correlation between dynamic and static stereoscopic measurements.
Methods: Experiments of this study were -performed using a rotating mirror apparatus to measure DVA, which was developed by the researcher and used to project an arbitrary Landolt C on a screen.
Dynamic stereopsis was evaluated with the Howard-Dolman test. When the subject determined that both bars were aligned on the horizontal line, the data were averaged from five measurements. Static stereoscopy was evaluated with the Ttitmus fly test and measured bilaterally. In situ examination was performed using a prism bar, and the total level of horizontal prism used in the experiment was manufactured in 16 steps, starting from a low prism amount.
Results: The overall mean DVA was 79.98 ± 20.98 o/s, and the average dynamic stereoscopic value was 19.28 ± 1.67 s of arc. The average static consolidations were 58.13, 52.50, and 51.00 s of arc in groups A, B, and C, respectively. DVAs based on the amount of inclination were 64.29 o/s, 77.47 o/ s, and 87.27 o/s for 0 Δ, 1~3 Δ, and 4 Δ or above, respectively.
Conclusions: The group with high DVA had higher dynamic and static stereotypes than the group with low DVA. In the analysis based on exophoria, DVA increased up to an exophoria of 4 Δ but decreased at an exophoria of 4 Δ or higher.
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KEYWORD
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Dynamic visual acuity, Dynamic stereoacuity, Static stereoacuity
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