Optical coherence tomography-based corneal power measurement and intraocular lens power calculation following laser vision correction (an American Ophthalmological Society thesis).
Optical coherence tomography-based corneal power measurement and intraocular lens power calculation following laser vision correction (an American Ophthalmological Society thesis).
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发表时间：
2013-09
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通讯作者：
David Huang;M. Tang;Li Wang;Xinbo Zhang;R. Armour;D. Gattey;Lorinna Lombardi;D. Koch
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作者：
David Huang;M. Tang;Li Wang;Xinbo Zhang;R. Armour;D. Gattey;Lorinna Lombardi;D. Koch
目的应用光学相干断层扫描(OCT)测量角膜屈光度，改进白内障激光矫正术后人工晶状体(IOL)屈光度的选择。方法在两个眼科中心对既往有近视矫正经历的患者进行前瞻性研究。用傅立叶域OCT测量角膜厚度和屈光度。用部分相干干涉仪测量眼轴长度、前房深度和自动角膜曲率计。提出了一种基于OCT的人工晶状体公式。将基于OCT的公式预测术后屈光度的平均绝对误差与两个基于回归的IOL公式进行比较。结果46例46眼均行单焦点人工晶状体植入术。术后平均屈光度预测误差：OCT公式为0.0 5±0.6 5 D，Haigis-L公式为0.14±0.83 D，无病史Shamma-PL公式为0.2 4±0.82 D。OCT的平均绝对误差为0.50D，而Haigis-L和Shamma-PL的平均绝对误差分别为0.67D和0.67D。调整后的平均绝对误差(剔除平均预测误差)：OCT为0.49D，Haigis-L为0.65D(P=0.031)，Shamas-PL为0.62D(P=0.044)。对于OCT，61%的眼预测误差在0.5D以内，而对于Haigis-L和Shamas-PL，46%的眼预测误差在0.5D以内(P=0.034)。结论基于OCT的人工晶状体屈光度预测精度优于Haigis-L公式和Shamas-PL公式。
PURPOSE To use optical coherence tomography (OCT) to measure corneal power and improve the selection of intraocular lens (IOL) power in cataract surgeries after laser vision correction. METHODS Patients with previous myopic laser vision corrections were enrolled in this prospective study from two eye centers. Corneal thickness and power were measured by Fourier-domain OCT. Axial length, anterior chamber depth, and automated keratometry were measured by a partial coherence interferometer. An OCT-based IOL formula was developed. The mean absolute error of the OCT-based formula in predicting postoperative refraction was compared to two regression-based IOL formulae for eyes with previous laser vision correction. RESULTS Forty-six eyes of 46 patients all had uncomplicated cataract surgery with monofocal IOL implantation. The mean arithmetic prediction error of postoperative refraction was 0.05 ± 0.65 diopter (D) for the OCT formula, 0.14 ± 0.83 D for the Haigis-L formula, and 0.24 ± 0.82 D for the no-history Shammas-PL formula. The mean absolute error was 0.50 D for OCT compared to a mean absolute error of 0.67 D for Haigis-L and 0.67 D for Shammas-PL. The adjusted mean absolute error (average prediction error removed) was 0.49 D for OCT, 0.65 D for Haigis-L (P=.031), and 0.62 D for Shammas-PL (P=.044). For OCT, 61% of the eyes were within 0.5 D of prediction error, whereas 46% were within 0.5 D for both Haigis-L and Shammas-PL (P=.034). CONCLUSIONS The predictive accuracy of OCT-based IOL power calculation was better than Haigis-L and Shammas-PL formulas in eyes after laser vision correction.