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目的 :人眼的屈光状态可由一新理论来分析 ,此理论基于几种不同眼生长部位的比值与实验值比较的结果。方法 :由光学成像理论可知 ,眼系统屈光状态可由眼轴长 (L) ,主平面 (L2 )及角膜及晶状体有效焦距 (f1 ,f2 )、曲率 (r1 ,r2 ,R1 ,R2 )及两者有效距离 (S)来表示。比值C1 =X/f1 ,X/f2 ,L/r1 ,L/R1的理论值符合实验值。本研究同时介绍一种有效眼模式(EEM) ,其由X ,C1及C2来描述。结果 :在正视态时 ,(C1 ,C2 ) =( 0 .59,0 .2 9) ,(L/r1 ,L/R1 ) =( 3.0 8,2 .3) ,(E1 ,E2 ) =( 0 .71 ,0 .2 9)。在标准范围内 ,各值为 (单位 :mm) ,f1 =( 2 9- 34) ,f2 =( 6 0 - 6 4) ,S =( 5.0 - 6 .5)。本理论求得L =( 2 2 - 2 5) ,而比值C1=( 0 .56 - 0 .6 ) ,C2 =( 0 .2 7- 0 .31 ) ;L/r1 =( 2 .8- 3.3) ,L/R1 =( 2 .1 - 2 .5) ;E1 =S/ (f1 -S) =( 0 .6 5- 0 .75) ,E2 =S/f2 =( 0 .2 7- 0 .32 )。本研究理论值L/r1符合Hong等人所测的实验值 ( 2 .75- 3.2 8)。结论 :人眼的发展可由本研究理论统一描述 ,EEM含C1 ,C2 ,E1 ,E2四个比值 ,可用来预测人眼最有可能的生长趋势 (正视及非正视态 )。
PURPOSE: The refractive status of the human eye can be analyzed by a new theory based on the comparison of the ratios of several different eye growth sites to experimental values. Methods: According to the theory of optical imaging, the refractive status of the ocular system can be described by the axial length (L), the main plane (L2) and the effective focal length (f1, f2), curvature (r1, r2, R1, R2) The effective distance (S) to represent. The theoretical value of the ratio C1 = X / f1, X / f2, L / r1, L / R1 corresponds to the experimental value. This study also describes an effective eye pattern (EEM), which is described by X, C1, and C2. Results: (C1, C2) = (0.59,0.29), (L / r1, L / R1) = (3.08,2.3), (E1, E2) = 0 .71, 0 .2 9). Within the standard range, the values are (unit: mm), f1 = (29-34), f2 = (60-64), S = (5.0-6.5). The theory finds that L = (2 2 - 2 5), and the ratio C1 = (0.56-0.6), C2 = (0.2-2.0.31); L / r1 = E1 = S / (f1 -S) = (0.6-6.0 0.75), E2 = S / f2 = (0.2-2.7) 0 .32). The theoretical value of this study, L / r1, is in accordance with the experimental value measured by Hong et al. (2.75-3.28). Conclusion: The development of the human eye can be described uniformly by the theory of this study. The EEM contains four ratios of C1, C2, E1 and E2 and can be used to predict the most likely growth trend of the human eye (frontal and non-frontal states).