ROLE OF THE AXIAL LENGTH CORNEAL RADIUS RATIO IN DETERMINING THE REFRACTIVE STATE OF THE EYE
ROLE OF THE AXIAL LENGTH CORNEAL RADIUS RATIO IN DETERMINING THE REFRACTIVE STATE OF THE EYE
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DOI：
10.1097/00006324-199409000-00005
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发表时间：
1994-09-01
影响因子：
1.4
通讯作者：
SCOTT, R
中科院分区：
文献类型：
--
作者：
GROSVENOR, T;SCOTT, R
我们的研究目的是调查眼轴长度和角膜半径的比率(AL/CR比率)在多大程度上决定人眼的屈光状态。研究对象为194名年龄在18岁至30岁之间的年轻人，他们的球镜等效屈光度范围为+7.91至-13.32D。每个受试者都测量了明显的客观屈光度、角膜半径和眼轴距离。使用Bennett和Rabbetts提出的公式来确定透镜的焦距。正视眼的AL/CR比率约为3.00，从高度远视的2.60到高度近视的4.10不等。AL/CR比值与球镜等效屈光度的线性回归决定系数为0.84，表明84%的屈光度变异可以用AL/CR比值的方差来解释。研究结果表明，对于给定数量的屈光不正，具有相对较高的AL/CR比率的眼睛倾向于使用低倍数的晶状体(表明晶状体已经正视化)，而具有相对较低的AL/CR比率的眼睛倾向于使用高倍数的晶状体。我们的结论是，AL/CR比率可以通过降低晶状体在轴向伸长的同时降低其倍率来提供有关晶状体正视化程度的信息。
The purpose of our study was to investigate the extent to which the ratio between axial length and corneal radius (the AL/CR ratio) determines the refractive state of the human eye. Subjects for the study were 194 young adults between the ages of 18 and 30 years, whose spherical equivalent refraction ranged from +7.91 to -13.32 D. For each subject, manifest objective refraction, corneal radii, and axial ocular distances were measured. Lens power was determined using a formula proposed by Bennett and Rabbetts. The AL/CR ratio was found to be approximately 3.00 for emmetropic eyes, ranging from 2.60 for the most highly hyperopic eye to 4.10 for the most highly myopic eye. The coefficient of determination of linear regression for the AL/CR ratio as a function of spherical equivalent refraction was 0.84, suggesting that 84% of the variance in refraction could be accounted for by variance of the AL/CR ratio. The results of the study suggest that for a given amount of ametropia, an eye having a relatively high AL/CR ratio would tend to have a low-powered lens (indicating that the lens had ''emmetropized''), whereas an eye having a relatively low AL/CR ratio would tend to have a high-powered lens. We conclude that the AL/CR ratio can provide information concerning the extent to which the lens has emmetropized by reducing its power concurrent with axial elongation.