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KMID : 1011420170220030237
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Journal of Korean Ophthalmic Optics Society
2017 Volume.22 No. 3 p.237 ~ p.242
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Distribution of Stereopsis-Perceptible Critical Slope in Verhoeff Stereoptor Test
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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 measure the critical slope for perception of stereopsis using the Verhoeff stereoptor.
Methods: 62 subjects (32 male and 30 female) with a mean age of 22.91±1.38 years participated in this study. After the Verhoeff stereoptor was mounted to a rotating plate, the critical distance perceiving stereopsis was determined for each subject. At the critical distance, the Verhoeff stereoptor was set as 90 degrees rotated in order to not perceive stereopsis. Then, until a subject firstly perceives stereopsis, the Verhoeff stereoptor was rotated in clockwise and counterclockwise directions, respectively.
Results: Mean of the perceiving in depth threshold was measured as 890.45±265.72 mm and it means convert to 51.83±29.80 seconds of arc in stereoacuity unit. Mean of the critical slope to be able to perceive stereopsis was 53.40±10.03 degrees in clockwise rotation and 54.32±10.46 degrees in counterclockwise rotation, respectively. The mean difference between two critical slopes was only 0.92 degrees and there was no significant statistically. The distribution in critical slope was that 38.71% in 59~50 degrees, 25.81% in 69~60 degrees, 22.58% in 49~40 degrees, 8.06% in less than 39 degrees, 3.23% in 79~70 degrees, and 1.61% in 90~80 degrees.
Conclusions: The evaluation of stereopsis-perceptible critical slope could be applied to evaluate the detailed ability to respond to various stereoscopic environments in addition to static stereoscopic vision test.
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KEYWORD
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Stereopsis, Verhoeff stereoptor, Stereoacuity, Stereopsis-perceptible distance, Stereopsis-perceptible critical slope
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