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KMID : 1011420150200030385
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Journal of Korean Ophthalmic Optics Society
2015 Volume.20 No. 3 p.385 ~ p.390
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Comparison and Correlation between Distance Static Stereoacuity and Dynamic Stereoacuity
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Kim Young-Cheong
Kim Sang-Hyun
Shim Hyun-Suk
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Abstract
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Purpose: This study evaluated the static stereoacuity by Distance Randot Stereotest (STEREO OPTICAL. Co.,Inc. USA) and the dynamic stereoacuity by three-rods test (iNT, Korea). Criterion and correlation of stereoacuity between both tests and usefulness of two stereotest methods were also evaluated.
Methods: For normal adults of 109 (male 61, female 48), mean age of 20.88 (19-32 years) years old, static stereoacuity by using Distance Randot Stereotest at 3 m distance, dynamic stereoacuity by using three-rods test at 2.5 m distance were measured.
Results: The mean of distance static stereoacuity was 155.77±133.11 sec of arc and the mean of error distance dynamic stereoacuity 11.13±9.69 mm. With equivalent-conversion stereoacuity of 23.44±20.96 sec of arc, there was statistically significant differences (p=0.00) between two dynamic stereoacuity, but correlation was relatively low (ρ=0.226). In the case of dynamic stereoacuity, separated to normal range by criterion of the error distance 20 mm, it showed the error distance of less than 20 mm in 97 subjects(89%) whose average of error distance and conversion mean dynamic stereoacuity were 8.43±5.10 mm and 17.68±10.67 sec of arc. repectively. The error distance of was equivalent-conversion dynamic stereoacuity 40.99 sec of arc (PD 62 mm basis) was 20 mm.
Conclusions: The results of lower correlation between static and dynamic stereoacuity suggest that seterotest should be applied separately to different functions. The results of this study also suggest that Distance Randot Stereotest can be applied to static stereoacuity excluding monocular cues. Three-rods test can be applied to dynamic stereoacuity containing the response of the eye-hand coordination in the daily life of natural vision condition, including the monocular cues. These different approaches canprovide a criterion of the two stereoacuity and parallel use of the two tests would be useful. For dynamic stereoacuity by three-rods test, error distance 20 mm in a normal range of adults can be used as a criteria to get statistical meaning of the results.
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KEYWORD
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Distance stereoacuity, Distance static stereoacuity, Distance dynamic stereoacuity, Distance randot stereotest, Three-rods test, Monocular cue
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