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KMID : 1011420190240010071
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Journal of Korean Ophthalmic Optics Society
2019 Volume.24 No. 1 p.71 ~ p.75
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Comparison between Stereopsis Measured in a Natural Space and that Measured Using an Apparatus
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Kim Hyeong-Su
Moon Byeong-Yeon
Yu Dong-Sik
Kim Sang-Yeob
Cho Hyun-Gug
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Abstract
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Purpose: To compare stereoacuity measured in a natural space with that measured using an instrument in a distant dynamic stereopsis test and to analyze the correlation coefficient between the two measured values.
Methods: Twentyfive subjects (10 males and 15 females) with a mean age of 23.64±1.58 years participated in the test. The refractive error of the subjects was fully corrected, and the viewing angle in the dynamic stereopsis test was 10°. At a 2.5-m distance, fixative targets for the test were three rods and three light sources. At a 25-m distance, fixative tergets for the test were three penguins (subjects dressed as penguins).
Results: The measured stereoacuity at a 25-m distance in the natural space (8.39±3.61 sec of arc) was significantly (p<0.001, p<0.001) higher than that measured in the test using three rods (38.28±45.81 sec of arc) and that using three light sources (33.33±23.12 sec of arc) at a 2.5-m distance. The correlation coefficient between stereoacuity measured at a 25-m distance in a natural space and that measured at a 2.5-m distance was very low (r = 0.010, r = 0.174). Conclusions: The values measured by the stereopsis test using three rods at a 2.5-m distance do not accurately reflect stereoscopic ability in a natural space, and it is possible to compensate for this disadvantage by increasing the test distance.
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KEYWORD
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Dynamic stereopsis, Test using three rods, Natural space, Stereoacuity
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