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首页> 外文期刊>BMC Ophthalmology >Intraocular lens power calculation using standard formulas and ray tracing after DMEK in patients with Fuchs endothelial dystrophy
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Intraocular lens power calculation using standard formulas and ray tracing after DMEK in patients with Fuchs endothelial dystrophy

机译：Fuchs内皮营养不良患者使用标准公式和DMEK后的光线追踪计算人工晶状体能力

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Background The study presented here aims to optimize the accuracy of intraocular lens (IOL) power calculations in patients after DMEK by evaluation of the impact of the altered anterior/posterior corneal curvature relationship. Methods Scheimpflug-based Oculus Pentacam imaging was performed after DMEK surgery for Fuchs endothelial dystrophy. The IOL power was calculated for all patients by ray tracing, aiming for postoperative emmetropia. We also performed the IOL calculation using four third-generation formulas (SRK-T, Hoffer-Q, Holladay-1 and Haigis). The residual refractions for the individual target IOL were compared and analyzed. Results This retrospective study included 42 eyes of 33 patients (age 68.73?±?10.11?years) after DMEK surgery. The differences between the expected residual refraction based on ray tracing and that predicted with the third-generation formulas were statistically significant (all formulas p Conclusions DMEK surgery induced a relevant change in the anterior to posterior corneal curvature relationship; this needs to be taken into account in the IOL power calculation to avoid hyperopic refractive surprises.
机译：背景技术本文提出的研究旨在通过评估改变的前/后角膜曲率关系的影响，来优化DMEK患者的人工晶状体（IOL）屈光度计算的准确性。方法DMEK手术治疗Fuchs内皮营养不良后，进行基于Scheimpflug的Oculus Pentacam成像。通过射线追踪计算所有患者的IOL屈光力，目的是术后正视。我们还使用四个第三代公式（SRK-T，Hoffer-Q，Holladay-1和Haigis）执行了IOL计算。比较并分析了各个目标IOL的残留折射。结果这项回顾性研究包括DMEK手术后33例（年龄68.73±10.11岁）的42眼。基于射线追踪的预期残留屈光度与第三代公式预测的残差之间的差异具有统计学意义（所有公式p结论DMEK手术引起了角膜曲率前到后关系的相关变化;需要考虑这一点）在IOL屈光力计算中避免远视屈光不正。

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