Seo Kyoung Yul, Im Chan Young, Yang Hun, Kim Tae-im, Kim Eung Kweon, Kim Terry, Nam Sang Min
From the Department of Ophthalmology (Seo, T-i. Kim, E.K. Kim), Eye and Ear Hospital, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine; the Ian Eye Center (Im); the SU Yonsei Eye Clinic (Yang); the Corneal Dystrophy Research Institute (T-i. Kim, E.K. Kim), Yonsei University College of Medicine, Seoul; the Department of Ophthalmology (Nam), CHA Bundang Medical Center, CHA University, Seongnam, South Korea; the Department of Ophthalmology (T. Kim), Duke Eye Center, Durham, North Carolina, USA.
From the Department of Ophthalmology (Seo, T-i. Kim, E.K. Kim), Eye and Ear Hospital, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine; the Ian Eye Center (Im); the SU Yonsei Eye Clinic (Yang); the Corneal Dystrophy Research Institute (T-i. Kim, E.K. Kim), Yonsei University College of Medicine, Seoul; the Department of Ophthalmology (Nam), CHA Bundang Medical Center, CHA University, Seongnam, South Korea; the Department of Ophthalmology (T. Kim), Duke Eye Center, Durham, North Carolina, USA.
J Cataract Refract Surg. 2014 Nov;40(11):1834-42. doi: 10.1016/j.jcrs.2013.11.044. Epub 2014 Oct 23.
To calculate the keratometric (K) reading in corneas modified by myopic keratorefractive surgery using the total corneal refractive power (TCRP) of the Pentacam rotating Scheimpflug camera.
University hospitals and private clinics, South Korea
Evaluation of diagnostic test or technology.
The study comprised healthy eyes, eyes having myopic keratorefractive surgery, and eyes having cataract surgery after myopic keratorefractive surgery. The conversion equation from the TCRP in the central 4.0 mm zone (TCRP4) to a K reading was derived in normal corneas. This equation was rechecked and its application range extended in corneas modified by myopic keratorefractive surgery. Then, the predictability of the TCRP method, combining the K reading derived from the TCRP4 and the Holladay 2 formula, was evaluated in a case series of cataract surgery patients who had previous myopic keratorefractive surgery.
The K reading derived from the TCRP4 was obtained by adding 0.7 diopter (D). This conversion factor was applicable after myopic keratorefractive surgery because changes in TCRP4 were equal to changes in refraction in the 4.0 mm zone. The TCRP method predicted intraocular lens power within ± 0.5 D in 83% and within ± 1.0 D in 94% of eyes having cataract surgery after myopic keratorefractive surgery.
The TCRP4 of the rotating Scheimpflug camera was successfully converted into the equivalent K reading, and the TCRP method showed good predictability in corneas modified by myopic keratorefractive surgery.
No author has a financial or proprietary interest in any material or method mentioned.
使用Pentacam旋转式Scheimpflug相机的总角膜屈光力（TCRP）计算近视角膜屈光手术后角膜的角膜曲率计（K）读数。
韩国的大学医院和私人诊所
诊断测试或技术评估
该研究包括健康眼睛、接受近视角膜屈光手术的眼睛以及近视角膜屈光手术后接受白内障手术的眼睛。在正常角膜中得出中央4.0毫米区域的TCRP（TCRP4）到K读数的转换方程。在近视角膜屈光手术改变的角膜中重新检查该方程并扩展其应用范围。然后，在一系列曾接受近视角膜屈光手术的白内障手术患者中评估TCRP方法的可预测性，该方法结合了从TCRP4得出的K读数和Holladay 2公式。
从TCRP4得出的K读数是通过加上0.7屈光度（D）获得的。这个转换因子在近视角膜屈光手术后适用，因为TCRP4的变化等于4.0毫米区域内的屈光度变化。在近视角膜屈光手术后接受白内障手术的眼睛中，TCRP方法在83%的眼睛中预测眼内晶状体屈光度在±0.5 D以内，在94%的眼睛中在±1.0 D以内。
旋转式Scheimpflug相机的TCRP4成功转换为等效的K读数，并且TCRP方法在近视角膜屈光手术改变的角膜中显示出良好的可预测性。
没有作者对文中提及的任何材料或方法拥有财务或专利权益。
