Barrett RX tool for intraocular lens power calculation in pseudophakic eyes undergoing intraocular lens exchange.

IF 2.6 3区 医学 Q2 OPHTHALMOLOGY
Klemens Paul Kaiser, Tyll Jandewerth, Joukje C Wanten, Christoph Lwowski, Mariam Sobhi, Rudy M M A Nuijts, Thomas Kohnen
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Abstract

Purpose: To assess the accuracy of refraction prediction after intraocular lens (IOL) exchange using a software integrated in a Scheimpflug-based biometer.

Setting: Two tertiary referral hospitals.

Design: A first case series.

Methods: Eyes that underwent uneventful bag-to-bag IOL exchange between 2017 and 2024 and complete pre- and postoperative measurements were included. IOL exchange was performed by two experienced surgeons. IOL power was calculated using the Barrett RX formula integrated in Pentacam software (Oculus Optikgeräte GmbH, Wetzlar, Germany), incorporating both phakic and pseudophakic biometric data and subjective refraction. Prediction errors were computed by comparing actual postoperative and predicted refractions. Moreover, a unpublished estimation formula was applied.

Results: Twenty-five eyes of 25 patients (mean age 60.2±11.4 years) were included. Mean interval between primary IOL implantation and exchange was 25.3±31.5 weeks. In 11/25 eyes, a different IOL model was implanted during the exchange. Using the Barrett RX formula, the mean prediction error (MPE) was 0.02±0.32D, mean absolute error (MAE) 0.27±0.17D, and median absolute error (MedAE) 0.22D. A total of 56% and 92% of eyes were within ±0.25D and ±0.50D of target refraction, respectively. The conventional formula yielded a comparable MPE of -0.12±0.68D (p=0.479), but higher MAE and MedAE (0.53±0.42D and 0.40D, p<0.001), with 32% and 56% of eyes within ±0.25D and ±0.50D, respectively.

Conclusion: The Barrett RX formula has been demonstrated to be an efficacious method for calculating IOL power in eyes undergoing IOL exchange, with more than half of cases within ±0.25D of the predicted post-exchange refraction.

Barrett RX工具用于人工晶状体置换术中人工晶状体度数的计算。
目的:评估基于scheimpflug生物计集成软件对人工晶状体(IOL)置换术后屈光预测的准确性。环境:两个三级转诊医院。设计:第一个案例系列。方法:纳入2017年至2024年期间顺利进行袋对袋人工晶状体置换术的眼睛,并进行完整的术前和术后测量。人工晶状体置换由两位经验丰富的外科医生进行。使用Pentacam软件(Oculus Optikgeräte GmbH, Wetzlar, Germany)集成的Barrett RX公式计算人工晶状体度数,结合晶状体和假晶状体生物识别数据和主观屈光。通过比较术后实际屈光度和预测屈光度来计算预测误差。此外,还采用了一个未发表的估计公式。结果:25例患者25只眼,平均年龄60.2±11.4岁。人工晶状体植入术至置换术平均间隔25.3±31.5周。11/25只眼在交换过程中植入不同的IOL模型。采用Barrett RX公式,平均预测误差(MPE)为0.02±0.32D,平均绝对误差(MAE)为0.27±0.17D,中位绝对误差(MedAE)为0.22D。56%和92%的眼睛分别在目标折射±0.25D和±0.50D范围内。常规公式的MPE为-0.12±0.68D (p=0.479),但MAE和MedAE较高(分别为0.53±0.42D和0.40D)。结论:Barrett RX公式已被证明是计算人工晶状体置换术后人工晶状体度数的有效方法,超过一半的病例在人工晶状体置换术后预测屈光度±0.25D范围内。
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来源期刊
CiteScore
5.60
自引率
14.30%
发文量
259
审稿时长
8.5 weeks
期刊介绍: The Journal of Cataract & Refractive Surgery (JCRS), a preeminent peer-reviewed monthly ophthalmology publication, is the official journal of the American Society of Cataract and Refractive Surgery (ASCRS) and the European Society of Cataract and Refractive Surgeons (ESCRS). JCRS publishes high quality articles on all aspects of anterior segment surgery. In addition to original clinical studies, the journal features a consultation section, practical techniques, important cases, and reviews as well as basic science articles.
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