正视眼与近视眼角膜曲率的研究

Research of Corneal Curvature of Emmetropia and Myopia

目的研究角膜曲率与临床屈光变化之关系。方法用美国Ｌｅｉｃａ角膜曲率计对正视眼６２０只，近视眼５８０只进行角膜中央曲率测量。结果角膜中央曲率：正视眼为４３．８９２±１．４２３Ｄ，近视眼为４３．８２７±１．３５９Ｄ（Ｐ＞０．０５）；男性为４３．６３±１．３９５Ｄ，女性４４．１７±１．４４６Ｄ（Ｐ＜０．０１）。散光与角膜垂直及水平曲率相差较大有关。随着年龄增加，角膜中央曲率有增加的趋势。结论近视形成与角膜曲率关系不大，女性角膜曲率较男性大；散光形成与角膜形态不规则有较大关系，中老年屈光远视化主要是晶体屈折力减弱造成而非角膜曲率改变所致。

ObjectiveTo determine the relationship between corneal curvature and clinical refractive change.MethodsWith a USA leica refractomerter,the corneal central curvature was measured in 620 normal eyes and 580 myopic eyes.ResultsCorneal central curvature measured as follows:normal eye∶43.892±1.423D,myopic eye∶43.827±1.359D( P >0.05);male∶43.63±1.395D,female∶44.17±1.446D( P <0.01).The astigmatism is related to the difference of corneal curvature between vertical direction and horizontal direction.The corneal central curvature slowly increases with an increase in age.ConclusionThere is no significant relationship between myopia and corneal curvature.Female corneal curvature is more than that of male.Irregular corneal form results in astigmatism.The reduction of the lens refractive power may be the reason for presbyopia for those in middle and old age.