De Rosa Giacomo, Criscuolo Daniele, Longo Laura, Allegrini Davide, Romano Mario R
Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini 4, Pieve Emanuele, 20072 Milan, Italy.
Eye Center, Humanitas Gavazzeni-Castelli, 24128 Bergamo, Italy.
J Clin Med. 2025 Jun 5;14(11):4010. doi: 10.3390/jcm14114010.
This study assessed the reliability of the Barrett True-K formula in patients who had undergone laser-based corneal refractive surgery by comparing outcomes using measured vs. predicted posterior corneal astigmatism (PCA) within the Barrett True-K No History formula. : We selected 49 eyes out of 41 patients with a history of uncomplicated laser visual correction (LVC) that underwent cataract surgery between 2020 and 2024. The Front K1 and K2, the Back K1 and K2, the anterior chamber depth, the lens thickness, the horizontal white-to-white, and the central corneal thickness were measured using Pentacam. The axial length was measured using the IOL Master 500 or NIDEK AL-Scan. These data were then imported into the freely available online Barrett True-K calculator for post-LVC eyes, and the postoperative results were compared with the predicted IOL target. The cumulative distribution of the refractive prediction error, absolute refractive prediction error, and refractive prediction error were calculated as the difference between the postoperative spherical equivalent and the expected spherical equivalent for both the predicted and measured PCA calculations. The results suggest improved accuracy with the Barrett True-K formula when incorporating measured PCA values, supporting the use of corneal tomography for optimized refractive outcomes in post-LVC cataract patients. It is always advisable to measure the posterior corneal surface using corneal tomography in all patients who have undergone LVC to achieve better refractive outcomes after cataract surgery.
本研究通过比较Barrett True-K无病史公式中测量的与预测的后角膜散光（PCA）的结果，评估了接受激光角膜屈光手术患者中Barrett True-K公式的可靠性。我们从41例有单纯激光视力矫正（LVC）病史且在2020年至2024年间接受白内障手术的患者中选取了49只眼。使用Pentacam测量前K1和K2、后K1和K2、前房深度、晶状体厚度、水平白对白距离和中央角膜厚度。使用IOL Master 500或NIDEK AL-Scan测量眼轴长度。然后将这些数据导入免费的在线Barrett True-K计算器中，用于LVC术后眼，并将术后结果与预测的人工晶状体目标进行比较。屈光预测误差、绝对屈光预测误差和屈光预测误差的累积分布计算为预测和测量的PCA计算中术后球镜等效度与预期球镜等效度之间的差值。结果表明，纳入测量的PCA值时，Barrett True-K公式的准确性有所提高，支持在LVC术后白内障患者中使用角膜地形图以优化屈光结果。对于所有接受过LVC的患者，为了在白内障手术后获得更好的屈光结果，使用角膜地形图测量后角膜表面总是明智的。
