Zeng Zongsheng, Ye Xiangyu, Chen Qingzhong, Jia Changkai, Zhang Guangbin
Xiamen Eye Centre, Affiliated with Xiamen University, 336 XiaHe Road, Xiamen, Fujian, China.
Am J Ophthalmol Case Rep. 2022 Apr 26;26:101547. doi: 10.1016/j.ajoc.2022.101547. eCollection 2022 Jun.
To report two challenging intraocular lens power calculation cases with patients each underwent different successive corneal refractive surgeries, respectively.
Biometry data, including the Back to Front corneal radii ratio (B/F ratio), were collected by Lenstar, IOL Master, and Pentacam AXL for Case 1 (received radial keratotomy (RK) and photorefractive keratectomy (PRK)) and Case 2 (received RK and laser-assisted in situ keratomileusis (LASIK)). The IOL power calculation was determined by several methods, including Shammas, Haigis-L, and Barrett True-K, which are available in the American Society of Cataract and Refractive Surgery online calculator and Pentacam AXL. The Barrett True-K (no history, post-RK) was more accurate in Case 1 (increased B/F ratio), whereas the Shammas, Haigis-L, and Barrett True-K (no history, post-LASIK/PRK) were more accurate in Case 2 (decreased B/F ratio).
The B/F ratio may be a factor to be considered when selecting the IOL power calculation formula for patients who undergo two different corneal refractive surgeries. The further study focusing on this issue should be performed to clarify the results in the future.
报告两例具有挑战性的人工晶状体屈光度计算病例，两名患者分别接受了不同的连续角膜屈光手术。
通过Lenstar、IOL Master和Pentacam AXL收集了病例1（接受放射状角膜切开术（RK）和准分子激光角膜切削术（PRK））和病例2（接受RK和准分子激光原位角膜磨镶术（LASIK））的生物测量数据，包括前后角膜半径比（B/F比）。人工晶状体屈光度计算通过多种方法确定，包括Shammas、Haigis-L和Barrett True-K，这些方法可在美国白内障与屈光手术学会在线计算器和Pentacam AXL中获得。Barrett True-K（无手术史，RK术后）在病例1（B/F比增加）中更准确，而Shammas、Haigis-L和Barrett True-K（无手术史，LASIK/PRK术后）在病例2（B/F比降低）中更准确。
对于接受两种不同角膜屈光手术的患者，在选择人工晶状体屈光度计算公式时，B/F比可能是一个需要考虑的因素。未来应针对此问题开展进一步研究以明确结果。
