Abstract
Purpose: To determine whether the distance between objects and the size of object are factors to be able to affect dynamic stereoacuity. Methods: Subjects were 37 adults (26 males and 11 females) with an average age of $23.89{\pm}1.76$. Refractive error was fully corrected for all subjects and each visual acuity of them was over 0.9. Three rods test was performed for measurement of stereoacuity. The viewing angles from left rod to right rod were set $5^{\circ}$, $10^{\circ}$, and $15^{\circ}$ and the rod thickness used 7 mm, 14 mm, and 21 mm, respectively. Stereoacuity was repeatedly measured three times in each test condition at 2.5 m distance, and reported the average value of them. Results: When rod thickness was 7 mm or 14 mm, dynamic stereoacuity decreased as the viewing angle increased, and they were significantly decreased (p<0.01) at viewing angles of $10^{\circ}$ and $15^{\circ}$ as compared with that of at $5^{\circ}$, respectively. When rod thickness was 21 mm, dynamic stereoacuity decreased as the viewing angle increased, especially, that of at $15^{\circ}$ decreased significantly (p<0.01) as compared with that of at $5^{\circ}$. The dynamic stereoacuity depending on the rod thickness have an increasing tendency as the rod thickness increased. Conclusions: The viewing angle between objects and the size of viewing object were factors that affect to dynamic stereoacuity.
목적: 주시물체간의 거리와 물체의 크기 변화가 동적입체시력에 변화를 주는 요인인지 확인하고자 하였다. 방법: 피검사자는 평균연령 $23.89{\pm}1.76$세의 37명(남26명, 여11명)이었다. 모든 피검사자는 완전교정된 안경을 착용하였으며, 교정시력은 0.9 이상이었다. 입체시력은 세막대검사를 실시하였고, 좌 우 막대간 시야각은 $5^{\circ}$, $10^{\circ}$, 그리고 $15^{\circ}$, 막대두께는 7 mm, 14 mm, 그리고 21 mm로 하여 각각의 조건을 설정하였다. 각 조건에서의 입체시력 측정은 2.5 m 거리에서 각각 3회 반복측정하여 평균값을 기록하였다. 결과: 막대두께가 7 mm, 14 mm일 때, 시야각이 커질수록 동적입체시력이 감소하였으며, 시야각 $5^{\circ}$와 비교하여 $10^{\circ}$와 $15^{\circ}$에서 각각 유의하게 감소하였다(p<0.01). 막대두께가 21 mm일 때, 시야각이 커질수록 동적입체시력이 감소하였으며, 특히 시야각 $5^{\circ}$와 비교하여 $15^{\circ}$에서 유의하게 감소하였다(p<0.01). 막대두께에 따른 동적입체시력은 막대가 두꺼워질수록 입체시력이 증가하는 경향이었다. 결론: 주시물체간의 시야각과 주시물체의 크기는 동적입체시력에 영향을 주는 요인인 것으로 나타났다.
