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KMID : 1011420150200030377
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Journal of Korean Ophthalmic Optics Society
2015 Volume.20 No. 3 p.377 ~ p.384
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The Comparasion of the Dynamic Stereoacuity with Two-Rods Test and Three-Rods Test
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Shim Hyun-Suk
Kim Sang-Moon
Kim Sang-Hyun
Kim Young-Cheong
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Abstract
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Purpose: On this study, we measured and compared the dynamic stereoacuity by two-rods test (Howard-Dolman Test) and three-rods test. And we analyzed the correlation between PD and refractive error with dynamic stereoacuity.
Methods: Dynamic stereoacuity of two-rods test and three-rods test at 2.5 m distance for 93 adults 93 (50 males, 43 females), mean age of 21.27±2.32 (19~32) years old, were measured 5 times for two tests.
Results: The mean of dynamic stereoacuity measured by two-rods test and three-rods test were 29.91±23.03 sec of arc and 23.75±21.65 sec of arc for total subjects, respectively. The mean of male and female were 36±22.38 sec of arc and 22.28±23.79, respectively. Three-rods test showed better dynamic stereoacuity than two-rods test, but there was no statistically significant difference (p>0.05). For the average standard deviation of PD between 60.63 mm~66.19 mm, dynamic stereoacuity fo two-rod test and three-rod test were 31.48±24.87 sec of arc and 31.48±24.87 sec of arc, respectively. The results showed statistically significant difference (p<0.05), but the relationship between dynamic stereoacuity and PD was not great. Comparison between two tests on the basis of refractive error, dynamic stereoacuity by three-rods test was better than by two-rods test with no significant difference between both tests (p>0.05) and there was little correlation between refractive error and two dynamic stereoacuity.
Conclusions: Three-rods test showing lower stereoacuity than two-rods tests could measure the lower minimum threshold of dynamic stereoacuity. It was found that both tests can be applied to dynamic stereoacuity test as a standard test, and PD and refractive error was found that little effect upon the dynamic stereoacuity. PD and refractive error was found that little effect upon the dynamic stereoacuity.
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KEYWORD
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Two-Rods Test, Three-Rods Test, Howard-Dolman Test, Dynamic stereoacuity, Dynamic stereoacuity test
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