Objective To compare the accuracy of different methods for calculating human lens power when lens thickness is not available and find suitable methods for large-scale studies of refractive development. Methods In this cross-sectional survey， lens power was calculated by three different methods. The three methods used the biometry and refraction data of 378 emmetropic eyes of 189 subjects （age range， 7-14 years）. These three methods consist of the Bennett method， which uses lens thickness， and a modification of the Stenström method and the Bennett-Rabbetts method， both of which do not require knowledge of lens thickness. Lens powers calculated with the modified-Stenström and Bennett-Rabbetts methods were compared for accuracy to those calculated with the Bennett method. Data were analyzed by a paired sign test， Wilcoxon rank sum test and Pearson correlation analysis. Results Using the Gullstrand-Emsley and Bennett-Rabbetts eye models， the modified-Stenström method gave lens powers that were approximately 0.46±0.35 D and 0.29±0.35 D lower than the Bennett lens powers and were significantly different from it （signrank=-159.5， -120， P<0.01）. The Bennett-Rabbetts method gave lens powers that were approximately 0.27±0.35 D and 0.09±0.34 D lower and were significantly different from the Bennett lens powers （signrank=-112.5， -42， P<0.01）. By customizing the c constants， the differences in the two methods were remarkably reduced to nonsignificance （signrank=5， P>0.05）. The largest difference was just 1.35 D. Agreement with the Bennett method was within ±0.50 D for 85.4% of the eyes. The lens power differences determined with the Bennett and Bennett-Rabbetts methods decreased with age for children 7-12 years old and increased with age for children above 12 years old （χ²=314.53， P<0.01）. The power difference between the two methods had a negative correlation with age （r=-0.36， P<0.01）. Conclusion With appropriately customized constants， the Bennett-Rabbetts method provides a good approximation of the Bennett lens power in emmetropic eyes. However， the agreement between the two methods for myopia and hyperopia needs further study.
朱梦钧,瞿小妹,何鲜桂,赵惠娟,朱剑锋. 不同晶状体屈光力计算公式在儿童屈光发育档案中的应用比较[J]. 中华眼视光学与视觉科学杂志, 2014, 16(9): 546-550.
Zhu Mengjun,Qu Xiaomei,He Xiangui,Zhao Huijuan,Zhu Jianfeng. Compare the accuracy of different methods to estimate human lens power in the refractive development of children. Chinese Journal of Optometry Ophthalmology and Visual science, 2014, 16(9): 546-550. DOI: 10.3760/cma.j.issn.1674-845X.2014.09.008
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