Determining postoperative anterior chamber depth
Determining postoperative anterior chamber depth
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DOI：
10.1016/s0886-3350(03)00414-0
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发表时间：
2003-11-01
影响因子：
2.8
通讯作者：
Drexler, W
中科院分区：
文献类型：
--
作者：
Kriechbaum, K;Findl, O;Drexler, W
目的。比较术后前房深度(ACDs)的测量值和计算值。奥地利维也纳大学眼科和医学物理研究所和德国美因茨大学眼科。方法：利用部分相干干涉测量仪(PCI)对189只人工晶状体眼术后的ACD进行测量。在6个人工晶状体(IOL)组中，根据SRK公式中最著名的A常数，通过光线追踪法计算平均ACD。此外，对于每种人工晶状体类型，将每种测量的ACD值与使用术后屈光度的个体球镜当量计算的值进行比较。结果：ACD值的实测值与计算值接近，没有系统性差异。然而，研究中获得的ACD值与人工晶状体制造商公布的值有很大不同。将经PCI评估的ACDs与术后验光计算值进行比较，结果显示基于屈光状态的数据更加分散，这可能是自动验光仪的测量误差大于PCI的结果。高精度干涉测量和光线跟踪计算相互印证。应使用得出的平均ACD值，而不是制造商的值。通过术前高精度的PCI术前生物测量和人工晶状体屈光计算的数值光线追踪相结合，可以改善白内障手术的屈光效果。(C)2003年《儿童权利公约》和《经济、社会和文化权利公约》。
Purpose. To compare measured and calculated postoperative anterior chamber depths (ACDs).Setting. Department of Ophthalmology and Institute of Medical Physics, University of Vienna, Vienna, Austria, and Department of Ophthalmology, University of Mainz, Mainz, Germany.Methods: The postoperative ACD was measured in 189 pseudophakic eyes using a laboratory prototype of partial coherence interferometry (PCI). In 6 intraocular lens (IOL) groups, the mean ACD was calculated by ray tracing based on the best-known A-constants of the SRK formulas. In addition, for each IOL type, each measured ACD was compared with a value calculated using the individual spherical equivalent of the postoperative refraction.Results: The measured and the calculated ACD values were close and did not show systematic differences. The ACD values obtained in the study, however, differed significantly from the values published by the IOL manufacturers. A comparison of the PCI-assessed ACDs and the calculated values using the postoperative refraction showed more scattered results for the refraction-based data, which was probably the result of higher measurement errors with the autorefractometer than with PCI.Conclusions. High-precision interferometry measurements and ray-tracing calculations confirmed each other. The resulting mean ACD values should be used instead of the manufacturers' values. The refractive outcome of cataract surgery can be improved by combining preoperative high-precision PCI biometry and numerical ray tracing for IOL power calculations. (C) 2003 ASCRS and ESCRS.