Fitting of Scleral Lens in Keratoconus Patients. Comparison between the Traditional Method and a Mathematical Model

Abstract

Fitting scleral lens in management of keratoconus can be a good alternative. Objectives: To compare the adaptation of rigid gas permeable scleral lens in patients with keratoconus, mathematically calculated based on data from visante oct (optical tomography coherence) and the traditional method (trial and error). Materials and methods: Descriptive observational research was carried out. Rigid scleral contact lenses were adapted to eight patients (16 eyes) diagnosed with keratoconus, using two calculation methods: the traditional trial and error and calculating the parameters of the lens using a mathematical model, based on the topography data and the high-resolution ct with visante oct. With each method, the visual acuity was evaluated, as well as the number of tests needed for the final adaptation, the comfort and the ocular surface. Results: Visual acuity was the same in both methods and the assessment of the ocular surface presented statistical differences (p < 0.05 according to the Wilcoxon rank test) and clinically significant, where the method of mathematicalmodeling was better; likewise, the method of mathematical modeling achieved better comfort and a lower number of tests than the traditional. Conclusions: Using current technology can contribute to improve scleral lenses adaptation and to optimize time and resources.