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Corneal Biomechanical Properties After Soft Contact Lens Wear Measured on a Dynamic Scheimpflug Analyzer: A Before and After Study; [Proprietes Biomecaniques Corneennes Apres Le Port Des Lentilles De Contact Souples Mesurees Par Un Analyseur Dynamique Scheimpflug: Une Etude Avant Et Apres] Publisher Pubmed



Peyman A1 ; Ghoreishi M2 ; Hashemiestabragh SS3 ; Mirmohammadkhani M4 ; Mohammadinia M5 ; Pourazizi M1
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Authors Affiliations
  1. 1. Isfahan Eye Research Center, Department of Ophthalmology, Isfahan University of Medical Sciences, Feiz Hospital, Modares St., Isfahan, Iran
  2. 2. Parsian Vision and Research Institute, Department of Ophthalmology, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Isfahan Eye Research Center, Department of Ophthalmology, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Social Determinants of Health Research Center, Semnan University of Medical Sciences, Semnan, Iran And Department of Epidemiology and Biostatistics, School of Medicine, Semnan University of Medical Sciences, Semnan, Iran
  5. 5. Parsian Vision and Research Institute, Isfahan, Iran

Source: Journal Francais d'Ophtalmologie Published:2021


Abstract

Objectives: To evaluate the corneal biomechanics before and after daily use of contact lenses (CLs), measured by Scheimpflug-based devices. Methods: This prospective clinical study includes participants who were scheduled to use CLs daily for refractive error. The biomechanical parameters were measured by the Corneal Visualization Scheimpflug Technology (Corvis ST) before and one month after using the soft CLs. Results: Twenty-three subjects (46 eyes), including 16 female (76.2%) with a mean age of 28 ± 7.29 years, were enrolled. There was no significant difference among biomechanical factors measured before and after contact lens wear (P > 0.05). Using regression analysis of the biomechanical markers, we found a statistically significant association between second applanation length (A2 length) (P = 0.001), highest concavity radius (HCR) (P = 0.05), deflection amplitude ratio (DA_ratio) (P = 0.05) and integrated radius (P < 0.001) with age. Regarding spherical equivalent, we found a statistically significant association between central corneal thickness (CCT) (P = 0.05), A2 length (P = 0.03) and stiffness parameter at first applanation (SPA1) (P = 0.02). Conclusions: We did not find a significant difference in terms of corneal biomechanical parameters between baseline and month 1; but regression analyses showed a statistically significant association between A2 length, HCR, DA_ratio, integrated radius, CCT and SPA1 and certain subject characteristics. © 2021 Elsevier Masson SAS; Objectifs: Evaluer la biomecanique corneenne avant et apres l'utilisation quotidienne de lentilles de contact (CL), mesuree par des dispositifs bases sur le principe Scheimpflug. Methodes: Cette etude clinique prospective comprend des participants qui devaient utiliser quotidiennement des lentilles de contact. Les parametres biomecaniques ont ete mesures par la technologie de visualisation corneenne Scheimpflug (Corvis ST) avant et un mois apres l'utilisation des lentilles de contact souples. Resultats: Vingt-trois sujets (46 yeux), dont 16 femmes (76,2 %) avec un age moyen de 28 ± 7,29 ans, ont ete recrutes. Il n'y avait pas de difference significative entre les facteurs biomecaniques mesures avant et apres le port des lentilles de contact (p > 0,05). En utilisant l'analyse de regression des marqueurs biomecaniques, nous avons trouve une association statistiquement significative entre la deuxieme longueur d'aplanation (longueur A2) (p = 0,001), le rayon de concavite le plus eleve (HCR) (p = 0,05), le rapport d'amplitude de deviation (DA_ratio) (p = 0,05) et le rayon integre (p < 0,001) avec l’age. Concernant l’equivalent spherique, nous avons trouve une association statistiquement significative entre l’epaisseur corneenne centrale (CCT) (p = 0,05), la longueur A2 (p = 0,03) et le parametre de rigidite a la premiere aplanation (SPA1) (p = 0,02). Conclusions: Nous n'avons pas trouve de difference significative en termes de parametres biomecaniques corneens entre les valeurs de base et apres un mois d'utilisation; mais les analyses de regression ont montre une association statistiquement significative entre la longueur A2, l'HCR, le DA_ratio, le rayon integre, la CCT le SPA1 et certaines caracteristiques du sujet. © 2021 Elsevier Masson SAS
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