A Study of Relationship between Refractive Error Correction and Phoria Amount

눈의 굴절이상 교정과 사위와의 관계

Once refractive error of the eye was fully corrected, Maddox rod was used to investigate binocular vision function. When the deviations of subjects' eyes were measured, orthophoria. without any horizontal deviations, was found in 10%, esophoria in 55% and exophoria in 34% of the patients. Esodeviation of the eye was found to be greater than exo-deviation by 11%. This is also refracted in deviations found to be greater than $4{\Delta}$ diopter magnitude where esophoria was 23% and exophoria was 9%. Thus for the patients to achieve comfortable binocular vision function, binocular vision anomalies need to be considered in spectacle prescription. In examining ocular anomalies of corrected refractive error, the deviation of the eye differed from under corrected refractive power to over corrected refractive power. There was a decrease in exophoria and an increase in esophoria, with over correction. This was thought to be due to accommodation. Furthermore, calculated AC/A ratio was found to vary from 1.25 to 6.61 and its relationship to refractive error could not be determined.

눈의 굴정이상을 완전교정한 상태에서 양안시기능 알아보기 위해서 maddox rod를 이용하여 안구 편위량을 측정한 결과, 수평방향의 편위가 없는 정위는 10%, 내사위 55%, 외사위 34%로 나타났으며, 안구의 내측 편위가 외측편위보다 11% 많은 것으로 나타났다. 또한 4 프리즘 이상의 편위량을 갖고 있는 경우도 내사위 23%, 외사위 9%로 나타나 보다 쾌적한 양안시 기능을 유지하기 위해서는 안위이상을 고려한 처방이 되어야 한다. 굴절이상 교정별 안위 이상을 측정한 결과 저교정에서 과교정 상태로 감에 따라 안위의 편위는, 외사위는 감소하고, 내사위는 그 정도가 증가하는 경향을 보였는데 이는 조절의 영향일 것으로 생각된다. 또한, heterophona 법으로 AC/A 비를 측정한 결과, 최저 1.25에서 6.61까지 분포하고 있었으며 굴절이상과는 관련성을 찾아볼 수 없었다.