散光与矫正视力的关系

RELATION OF ASTIGMATISM TO CORRECTED VISUAL ACUITY

我们对4～69岁927例(1751只散光眼)进行了统计分析。证实了循规、逆规以及斜轴散光仅是不同的屈光异态,各平均矫正视力差异无显著性(P>0.05);逆规性散光比重随年龄增长而增大,循规性散光比重则随年龄递增而递减,符合生理变化规律;散光度数愈高,矫正视力愈差,两者呈负相关(近视散光r=-0.9567,p<0.0025;远视散光r=-0.9810,p<0.001)。本文还讨论了循规、逆规散光转变的发生机理以及高度散光导致矫正视力不佳的原因。

The purpose of this study was to analyze 1751 astigmatical eyes in 927 cases wiih statistical method to evaluate correlations between astigmatism and corrected visual acuity. It was found that astigmatism with the rule and astigmatism against the rule as well as oblique axis as tigmatism presented no more than different refractive errors, failing to reach statistical significance in their corrected visual acuity ( P>0.05 ). The incidence of astigmatism against the rule had a tendency to increase with aging, which was a physical manifestation of aging process. The higher the astigmatic degree, the worse the corrected visual acuity. There appcared to be a clear negative correlation between the two (myopic astigmatism r = - 0.9567, P<0.0025; hypermetropic astigmatism r = - 0.9810, P<0. 001 ) . The etiology and mechanism which initiate the change from astigmatism with the rule to astigmatism against the rule and the worse corrected visual acuity due to the higher degree of astigmatism are discussed.