Journal of cataract and refractive surgery · 2022
Repeatability of a Scheimpflug tonometer to measure biomechanical parameters before and after myopic refractive surgery.
СтатьяРандомизированное исследованиеНазвание и аннотация: Перевод пока не подготовлен
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Lu Nan-Ji, Hafezi Farhad, Rozema Jos J, Hillen Mark, Hafezi Nikki, Zhang Jia, Koppen Carina
Аннотация
PURPOSE: To assess the repeatability of several corneal biomechanical parameters with a Scheimpflug tonometer (Corvis ST) in myopic eyes and eyes that underwent transepithelial photorefractive keratectomy (transPRK), small-incision lenticule extraction (SMILE), or femtosecond laser-assisted in situ keratomileusis (FS-LASIK) surgery.
SETTING: Eye Hospital of Wenzhou Medical University, Wenzhou, China.
DESIGN: Prospective randomized controlled study.
METHODS: 315 eyes from 315 patients (135 myopes, 58 post-transPRK, 52 post-SMILE, and 70 post-FS-LASIK) were included. 3 consecutive scans were performed to evaluate the repeatability of the 40 parameters examined.
RESULTS: 315 eyes were included. In all eyes, the coefficient of variation (CoV) for intraocular pressure (IOP) and biomechanical-corrected IOP (bIOP) ranged from 7.29% to 9.47% and 6.11% to 7.75%, respectively; the CoV of pachymetry was <0.8%. The intraclass correlation coefficient of Corvis Biomechanical Index-Laser Vision Correction (LVC) was 0.680 for post-transPRK, 0.978 for post-SMILE, and 0.911 for post-FS-LASIK. The CoV of Stress-Strain Index (SSI) was 204.93% for post-transPRK, 91.92% for post-SMILE, and 171.72% for post-FS-LASIK. The CoV of the 6 clinically important dynamic corneal response parameters ranged from 2.0% to 7.8% for myopia, 1.8% to 11.1% for post-transPRK, 2.1% to 8.7% for post-SMILE, and 1.8% to 8.8% for post-FS-LASIK.
CONCLUSIONS: Excellent intrameasurement repeatability of IOP, bIOP, and pachymetry was observed in all groups; SSI measurement in post-LVC corneas displayed more variation. Caution is warranted when assessing SSI in post-LVC corneas for the purpose of diagnosing iatrogenic ectasia or evaluating biomechanical remodeling of postoperative refractive corneas.
SETTING: Eye Hospital of Wenzhou Medical University, Wenzhou, China.
DESIGN: Prospective randomized controlled study.
METHODS: 315 eyes from 315 patients (135 myopes, 58 post-transPRK, 52 post-SMILE, and 70 post-FS-LASIK) were included. 3 consecutive scans were performed to evaluate the repeatability of the 40 parameters examined.
RESULTS: 315 eyes were included. In all eyes, the coefficient of variation (CoV) for intraocular pressure (IOP) and biomechanical-corrected IOP (bIOP) ranged from 7.29% to 9.47% and 6.11% to 7.75%, respectively; the CoV of pachymetry was <0.8%. The intraclass correlation coefficient of Corvis Biomechanical Index-Laser Vision Correction (LVC) was 0.680 for post-transPRK, 0.978 for post-SMILE, and 0.911 for post-FS-LASIK. The CoV of Stress-Strain Index (SSI) was 204.93% for post-transPRK, 91.92% for post-SMILE, and 171.72% for post-FS-LASIK. The CoV of the 6 clinically important dynamic corneal response parameters ranged from 2.0% to 7.8% for myopia, 1.8% to 11.1% for post-transPRK, 2.1% to 8.7% for post-SMILE, and 1.8% to 8.8% for post-FS-LASIK.
CONCLUSIONS: Excellent intrameasurement repeatability of IOP, bIOP, and pachymetry was observed in all groups; SSI measurement in post-LVC corneas displayed more variation. Caution is warranted when assessing SSI in post-LVC corneas for the purpose of diagnosing iatrogenic ectasia or evaluating biomechanical remodeling of postoperative refractive corneas.