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首页> 外文OA文献 >Development of a program for toric intraocular lens calculation considering posterior corneal astigmatism, incision-induced posterior corneal astigmatism, and effective lens position.
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Development of a program for toric intraocular lens calculation considering posterior corneal astigmatism, incision-induced posterior corneal astigmatism, and effective lens position.

机译：考虑到后角膜散光，切口引起的后角膜散光和有效晶状体位置，开发复曲面人工晶状体计算程序。

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Background: To evaluate the toric intraocular lens (IOL) calculation considering posterior corneal astigmatism, incision-induced posterior corneal astigmatism, and effective lens position (ELP). Methods Two thousand samples of corneal parameters with keratometric astigmatism >= 1.0 D were obtained using boot-strap methods. The probability distributions for incision-induced keratometric and posterior corneal astigmatisms, as well as ELP were estimated from the literature review. The predicted residual astigmatism error using method D with an IOL add power calculator (IAPC) was compared with those derived using methods A, B, and C through Monte-Carlo simulation. Method A considered the keratometric astigmatism and incision-induced keratometric astigmatism, method B considered posterior corneal astigmatism in addition to the A method, method C considered incision-induced posterior corneal astigmatism in addition to the B method, and method D considered ELP in addition to the C method. To verify the IAPC used in this study, the predicted toric IOL cylinder power and its axis using the IAPC were compared with ray-tracing simulation results. Results The median magnitude of the predicted residual astigmatism error using method D (0.25 diopters [D]) was smaller than that derived using methods A (0.42 D), B (0.38 D), and C (0.28 D) respectively. Linear regression analysis indicated that the predicted toric IOL cylinder power and its axis had excellent goodness-of-fit between the IAPC and ray-tracing simulation. Conclusions The IAPC is a simple but accurate method for predicting the toric IOL cylinder power and its axis considering posterior corneal astigmatism, incision-induced posterior corneal astigmatism, and ELP.
机译：背景：为了评估复曲面人工晶状体（IOL）的计算，考虑后角膜散光，切口引起的后角膜散光和有效晶状体位置（ELP）。方法采用引导带法获得2000例角膜散光> = 1.0 D的角膜参数样本。从文献综述中估算了切口引起的角膜散光和角膜后散光以及ELP的概率分布。通过蒙特卡罗模拟，比较了使用方法D和IOL附加功率计算器（IAPC）预测的残留像散误差与使用方法A，B和C得出的误差。方法A考虑了角膜散光和切口诱发的角膜散光，方法B除方法A之外还考虑了角膜后散光，方法C除方法B之外还考虑了切口引起的角膜后散光，方法D除方法外还考虑了ELP C方法。为了验证本研究中使用的IAPC，将使用IAPC预测的复曲面IOL圆柱体功率及其轴与光线跟踪模拟结果进行了比较。结果使用方法D预测的残留像散误差的中值幅度（0.25屈光度[D]）分别小于使用方法A（0.42 D），B（0.38 D）和C（0.28 D）得出的中值。线性回归分析表明，预测的复曲面IOL圆柱体功率及其轴在IAPC和光线跟踪仿真之间具有出色的拟合优度。结论IAPC是考虑到后角膜散光，切口引起的后角膜散光和ELP的简单而准确的方法，用于预测复曲面IOL镜筒屈光力及其轴。

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