Iida Yoshihiko, Shimizu Kimiya, Shoji Nobuyuki
Department of Ophthalmology, Kitasato University School of Medicine, Sagamihara 252-0374, Japan.
Eye Center, Sanno Hospital, Tokyo 107-0052, Japan.
J Clin Med. 2022 Jan 20;11(3):522. doi: 10.3390/jcm11030522.
A new method, the Iida-Shimizu-Shoji (ISS) method, is proposed for calculating intraocular lens (IOL) power that combines the anterior-posterior ratio of the corneal radius of the curvature after laser in situ keratomileusis (LASIK) and to compare the predictability of the method with that of other IOL formulas after LASIK.
The estimated corneal power before LASIK (Kpre) in the double-K method was 43.86 D according to the American Society of Cataract and Refractive Surgery calculator, and the K readings of the IOL master were used as the K values after LASIK (Kpost). The factor for correcting the target refractive value (correcting factor [C-factor]) was calculated from the correlation between the anterior-posterior ratio of the corneal radius of the curvature and the refractive error obtained using this method for 30 eyes of 30 patients.
Fifty-nine eyes of 59 patients were included. The mean values of the numerical and absolute prediction errors obtained using the ISS method were -0.02 ± 0.45 diopter (D) and 0.35 ± 0.27 D, respectively. The prediction errors using the ISS method were within ±0.25, ±0.50, and ±1.00 D in 49.2%, 76.3%, and 96.6% of the eyes, respectively. The predictability of the ISS method was comparable to or better than some of the other formulas.
The ISS method is useful for calculating the IOL power in eyes treated with cataract surgery after LASIK.
提出了一种新的方法，即饭田-清水-庄司（ISS）法，用于计算人工晶状体（IOL）度数，该方法结合了准分子原位角膜磨镶术（LASIK）后角膜曲率半径的前后比，并比较该方法与LASIK后其他IOL公式预测性。
根据美国白内障与屈光手术学会计算器，双K法中LASIK术前估计角膜屈光力（Kpre）为43.86 D，将IOL Master测量的K值用作LASIK术后的K值（Kpost）。根据30例患者30只眼的角膜曲率半径前后比与使用该方法获得的屈光不正之间的相关性，计算目标屈光值校正因子（校正因子[C因子]）。
纳入59例患者的59只眼。使用ISS法获得的数值预测误差和绝对预测误差的平均值分别为-0.02±0.45屈光度（D）和0.35±0.27 D。分别有49.2%、76.3%和96.6%的眼使用ISS法的预测误差在±0.25 D、±0.50 D和±1.00 D以内。ISS法的预测性与其他一些公式相当或更好。
ISS法可用于计算LASIK术后白内障手术眼的IOL度数。
