正常人角膜屈光力测定及生理性角膜散光的研究

Measure and study of Keratometry and Physiological Corneal Astigmatism in Normal Humans

测定了云南正常人５１５例１０３０眼的角膜前屈光力，结果显示：水平径线角膜前屈光力土为（４２．８２１士０．０４６）Ｄ；垂直径线前角膜前屈光力为（４３．３１５＋０．０４７）Ｄ；水平径线与垂直两径线间及性别间测定值存在显著差异，同性别间左右眼无显著差异；随年龄增大，角膜前屈光力呈减少趋势。正常人生理性散光为０．４９４Ｄ，９２．０２％分布在０．２５～１．００Ｄ之间，以顺规性散光为主。

The keratometric value was measured in 515 cases(l030 eyes)among normalpeople in Yunnan Province. As a result,the horizontal corneal refractive power was(42. 82l ±0.046)D while the vertical corneal refractive power was(43.315± 0.047)D;the keratometrywas significantly different between the horizontal and the vertical, and between males and fe-males; and no marked difference was observed between left and right eyes of the same sex. Thekeratometric value decreased with age. The physiological corneal astigmatism in a normal personwas 0.494 D, with 92.02%distributed between 0.25 D and l.00 D, and with direct astigma-tism being predominant.