The effect of rigid lens design on fluorescein fit

This paper describes an evaluation of rigid lens design undertaken using a computer spreadsheet-based model of fluorescein fit. The study systematically varied rigid lens parameters and corneal topography while monitoring the following key aspects of lens fit. percentage area of apparent corneal alignment, average tear layer thickness and edge clearance. The effect of changes in corneal curvature, corneal asphericity, astigmatism, back optic zone radius, back optic zone diameter and peripheral radii were evaluated. The findings enable a clearer understanding of the relationship between corneal topography, rigid lens parameters and rigid lens fit.