Clinical evaluation of rigid gas-permeable contact lens for subclinical keratoconus

Abstract

Objective To evaluation the clinical effectiveness of rigid gas permeable contact lenses (RGPCL) for subclinical keratoconus eyes. Methods Twenty-two subclinical stage ofkeratoconus eyes from 22 patients were treated by wearing of RGPCL and followed up for 1-24 months. Orbscan corneal topography system was used before and after the wearing of RGPCL. Results RGPCL can provide a significant improvement in visual acuity compared to spectacle correction for patients (P ＜0.05). Anterior corneal surface became flatter and I-S value became smaller after the fitting ofRGPCL (P ＜0.05). But anterior corneal surface curvature, posterior and anterior corneal surface height, corneal thickness, anterior chamber depth had no significant changes (P ＞0.05). Conclusions It is easy to reach the ideal fit and to improve the visual acuity. The RGPCL has effective orthokeratology for subclinical keratoconus. Key words: Keratoconus; Rigid gas permeable contact lenses (RGPCL); Orbscan corneal topography system