Department of Ophthalmology (I.D., J.R., M.H., L.A., C.K.), Antwerp University Hospital, Edegem, Belgium ; Department of Ophthalmology (E.O.K.), Ghent University Hospital, Ghent, Belgium ; and Visual Optics Lab Antwerp (VOLANTIS), Faculty of Medicine and Health Sciences (J.R., C.K.), University of Antwerp, Antwerp, Belgium .
Eye Contact Lens. 2022 Dec 1;48(12):497-502. doi: 10.1097/ICL.0000000000000941. Epub 2022 Sep 21.
To evaluate the effect of specialty contact lens (CL) wear on posterior corneal tomography in keratoconus subjects.
Patients with keratoconus who were wearing specialty CL were included in this retrospective cohort study. Tomographic parameters were evaluated with Scheimpflug imaging (Pentacam HR) before lens fitting and immediately after removal of CLs worn habitually for a period of several months. Subjects were divided into groups, according to type of lens (corneal, scleral, and hybrid) and keratoconus severity based on Belin/Ambrosio D (BAD-D) score, for further analysis.
Thirty-four eyes of 34 subjects diagnosed with keratoconus were included. Mean duration of habitual CL wear was 7.0±0.3 months. For the entire cohort, a small increase in flat keratometric reading at the anterior corneal surface (K1F; P =0.032) and at the posterior surface (K1B; P =0.041) was found. In the corneal CL group (10 eyes; 29.4%), flattening of the anterior corneal curvature was detected (K max ; P =0.015). An increase in K1B value was seen in the scleral CL group (15 eyes; 44.1%) ( P =0.03). Combined topometric indices showed a small but significant difference in the entire cohort ( P <0.05) and in the subgroups of corneal CL wear and of moderate keratoconus (BAD-D score≥7).
Various types of specialty CLs exert a differential influence on corneal parameters. A small steepening of keratometry at the posterior surface (K1B) was observed in the scleral lens group. Although corneal lens wear flattens the anterior cornea (K max ), it does not significantly alter the posterior corneal surface.
评估角膜接触镜（CL）的佩戴对圆锥角膜患者的后角膜断层成像的影响。
本回顾性队列研究纳入了佩戴特殊 CL 的圆锥角膜患者。在镜片适配之前以及在习惯性佩戴 CL 几个月后立即使用 Scheimpflug 成像（Pentacam HR）评估断层参数。根据镜片类型（角膜、巩膜和混合）和基于 Belin/Ambrosio D（BAD-D）评分的圆锥角膜严重程度，将患者分为不同组进行进一步分析。
共纳入 34 名圆锥角膜患者的 34 只眼。习惯性 CL 佩戴时间的平均长度为 7.0±0.3 个月。对于整个队列，在前角膜表面（K1F；P=0.032）和后表面（K1B；P=0.041）的角膜屈光度读数略有增加。在角膜 CL 组（10 只眼；29.4%）中，检测到前角膜曲率变平（K max；P=0.015）。在巩膜 CL 组（15 只眼；44.1%）中，K1B 值增加（P=0.03）。在整个队列中（P<0.05）和在角膜 CL 佩戴和中度圆锥角膜（BAD-D 评分≥7）亚组中，综合拓扑指数显示出微小但显著的差异。
各种类型的特殊 CL 对角膜参数有不同的影响。在巩膜镜片组中观察到后表面（K1B）的角膜曲率稍陡峭。尽管角膜镜佩戴会使前角膜变平（K max），但不会显著改变后角膜表面。
