| 소아F-021 |
| 수직프리즘과 수평 프리즘의 결합: 측정오류와 해결방법 |
| 한양대학교 의과대학 안과학교실(1)
성균관대학교 의과대학 안과학교실(2) |
| 박승훈(1), 김지홍(1), 신용운(1), 강민호(1), 성민철(1), 조희윤(1), 오세열(2), 임한웅(1) |
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목적 : We investigated measurement errors caused by the combination of vertical and horizontal ophthalmic prisms.
방법 : A Helium-Neon laser was used to determine the deviation resulting from combinations of vertical and horizontal ophthalmic prisms. Loose prisms were stacked together in a perpendicular direction, and horizontal and vertical prism bars were combined back to back. The induced deviation of a Helium-Neon laser beam by the combined prisms was recorded directly in centimeters.
결과 : The deviation induced by the combination of two loose prisms in a perpendicular direction was larger than their labeled values. These differences were found to increase with the power of the prisms. The measurement errors of the second prism were significantly greater than those of the first. In the combination of horizontal and vertical prism bars, only the measured deviations induced by the second prism bar were larger than their labeled values.
결론 : A combination of vertical and horizontal ophthalmic prisms can cause significant measurement errors that increase with the power of the prism. These errors can be minimized by using the combination of prism bars, positioning larger-degree prism in the calibrated position, and positioning one prism obliquely.
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