Potvin Richard, Hill Warren
From Science in Vision (Povin), Akron, New York, and East Valley Ophthalmology (Hill), Mesa, Arizona, USA.
From Science in Vision (Povin), Akron, New York, and East Valley Ophthalmology (Hill), Mesa, Arizona, USA.
J Cataract Refract Surg. 2015 Feb;41(2):339-47. doi: 10.1016/j.jcrs.2014.05.040.
To develop an algorithm to calculate intraocular lens (IOL) power for eyes with previous laser in situ keratomileusis (LASIK) for myopia based on data from a rotating Scheimpflug camera and to compare calculations with those of current formulas.
East Valley Ophthalmology, Mesa, Arizona, USA.
Observational case series.
Relevant IOL calculation and postoperative refractive data were obtained for eyes of patients who had previous myopic LASIK and subsequent cataract surgery. Initial screening and correlation analysis identified Pentacam Scheimpflug keratometry (K) values appropriate for use in calculating a "best K" for IOL power calculations in these eyes. Error analysis identified other eye measures to improve results. Final results were compared with results from 9 other calculation methods available on the American Society of Cataract and Refractive Surgery (ASCRS) web site.
The study obtained data from 101 eyes of 77 patients. More than 200 Scheimpflug K-formula combinations were evaluated for each eye. The true net power in the 4.0 mm zone centered on the corneal apex provided the best adjusted K reading for IOL power calculation in the Shammas no-history formula. The final formula had good outcomes, with 34%, 66%, and 91% of eyes being within ±0.25 diopter (D), ±0.50 D, and ±1.00 D of the refractive target, respectively. These results compare favorably to the best formulas on the ASCRS web site.
The no-history formula derived using the Scheimpflug device's true net power in the 4.0 mm zone centered on the corneal apex appears to be an accurate method for determining IOL power after LASIK for myopia. Corroboration with additional data sets is suggested.
Neither author has a financial or proprietary interest in any material or method mentioned.
基于旋转式眼前节分析系统（Scheimpflug）相机的数据，开发一种算法来计算曾接受准分子原位角膜磨镶术（LASIK）治疗近视的眼睛的人工晶状体（IOL）度数，并将计算结果与当前公式的计算结果进行比较。
美国亚利桑那州梅萨市东谷眼科。
观察性病例系列。
获取曾接受近视LASIK手术并随后接受白内障手术患者眼睛的相关IOL计算和术后屈光数据。初步筛选和相关性分析确定了适合用于计算这些眼睛IOL度数的“最佳角膜曲率（K）值”的眼前节分析系统角膜曲率测量值。误差分析确定了其他眼部测量方法以改善结果。将最终结果与美国白内障与屈光手术学会（ASCRS）网站上可用的其他9种计算方法的结果进行比较。
该研究获得了77例患者101只眼睛的数据。对每只眼睛评估了200多种眼前节分析系统K公式组合。以角膜顶点为中心的4.0毫米区域内的真实净屈光力为Shammas无手术史公式中IOL度数计算提供了最佳调整后的K读数。最终公式效果良好，分别有34%、66%和91%的眼睛屈光度数在屈光目标的±0.25屈光度（D）、±0.50 D和±1.00 D范围内。这些结果优于ASCRS网站上的最佳公式。
使用以角膜顶点为中心的4.0毫米区域内的眼前节分析系统真实净屈光力得出的无手术史公式似乎是确定近视LASIK术后IOL度数的准确方法。建议用其他数据集进行验证。
两位作者均未对文中提及的任何材料或方法拥有财务或专利权益。
