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离开可信路径：使用无功率植入物估算白内障手术眼中的角膜角膜曲率指数。

Leaving trusted paths: Estimating corneal keratometric index in cataract surgery eyes with zero-power implants.

机构信息

Rothschild Foundation Hospital, Paris, France.

Augen-Und Laserklinik, Castrop-Rauxel, Germany.

出版信息

Graefes Arch Clin Exp Ophthalmol. 2024 Aug;262(8):2533-2539. doi: 10.1007/s00417-024-06435-8. Epub 2024 Mar 8.

DOI:10.1007/s00417-024-06435-8
PMID:38456928
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11271351/
Abstract

PURPOSE

This study aimed to estimate the corneal keratometric index in the eyes of cataract surgery patients who received zero-power intraocular lenses (IOLs).

METHODOLOGY

This retrospective study analyzed postoperative equivalent spherical refraction and axial length, mean anterior curvature radius and aqueous humor refractive index to calculate the theoretical corneal keratometric index value (n). Data was collected from 2 centers located in France and Germany.

RESULTS

Thirty-six eyes were analyzed. The results revealed a mean corneal keratometric index of 1.329 ± 0.005 for traditional axial length (AL) and 1.331 ± 0.005 for Cooke modified axial length (CMAL). Results ranged from minimum values of 1.318/1.320 to maximum values of 1.340/1.340.

CONCLUSION

The corneal keratometric index is a crucial parameter for ophthalmic procedures and calculations, particularly for IOL power calculation. Notably, the estimated corneal keratometric index value of 1.329/1.331 in this study is lower than the commonly used 1.3375 index. These findings align with recent research demonstrating that the theoretical corneal keratometric index should be approximately 1.329 using traditional AL and 1.331 using CMAL, based on the ratio between the mean anterior and posterior corneal curvature radii (1.22).

摘要

目的

本研究旨在评估接受零度数人工晶状体（IOL）的白内障手术患者的角膜角膜曲率指数。

方法

这是一项回顾性研究，分析了术后等效球镜度数和眼轴长度、平均前曲率半径和房水折射率，以计算理论角膜曲率指数值（n）。数据来自法国和德国的 2 个中心。

结果

分析了 36 只眼。结果显示，传统眼轴（AL）的平均角膜曲率指数为 1.329±0.005，Cooke 改良眼轴（CMAL）的平均角膜曲率指数为 1.331±0.005。结果范围从最小的 1.318/1.320 到最大的 1.340/1.340。

结论

角膜曲率指数是眼科手术和计算的一个关键参数，特别是对于 IOL 屈光力计算。值得注意的是，本研究中估计的角膜曲率指数值 1.329/1.331 低于常用的 1.3375 指数。这些发现与最近的研究一致，该研究表明，基于平均前、后角膜曲率半径的比值（1.22），使用传统的 AL 时，理论角膜曲率指数应为 1.329，使用 CMAL 时应为 1.331。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1feb/11271351/fce9bd9bf4a3/417_2024_6435_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1feb/11271351/5406f1109010/417_2024_6435_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1feb/11271351/71108c6ee67f/417_2024_6435_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1feb/11271351/fce9bd9bf4a3/417_2024_6435_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1feb/11271351/5406f1109010/417_2024_6435_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1feb/11271351/71108c6ee67f/417_2024_6435_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1feb/11271351/fce9bd9bf4a3/417_2024_6435_Fig3_HTML.jpg

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