Rigid Gas-Permeable Semi-Scleral Contact Lenses after Radial Keratotomy: Apical Space, Lens Diameter, Limbal Clearance, Peripheral O-Rings, and Tear Exchange as Contact-Lens-Fitting Success Factors

The purpose of this case report is to verify if the adaptation a rigid gas-permeable contact lens can improve VA and comfort in patient with complications derived from radial keratotomy (RK) surgery. A semi-scleral was fitted 46-year-old female who had undergone bilateral RK before 30 years. uncorrected distance visual acuity right eye (RE) left (LE) 0.5 0.6 logMAR (minimum angle resolution), respectively. RE LE manifest refractions were +2.00 − 4.25 × 155 diopters (D) 3.00 15 D, Rose K2 XL™ both eyes. central clearance 400–450 µm 300–350 LE. corrected 0.1 0.16 logMAR, Semi-scleral lenses are comfortable beneficial choice for patients after when associated problems intolerance other therapeutic options. permit prolonged duration use without discomfort, adverse alterations, feeling glare scotopic vision. In present case, there multiple factors that influenced resolution, such as amount apical space, diameter, limbal clearance, peripheral O-rings, tear exchange.