Date of Award

5-2006

Degree Type

Thesis

Degree Name

Master of Science in Vision Science

Committee Chair

Peter Bergenske

Abstract

Purpose: The goal of this thesis was to try to determine the success rate of using spectacle prescription, iris diameter and keratometry measurements in fitting planned replacement soft toric contact lenses. The motivation factors for this thesis were: the need to minimize lens storage facility, to minimize amounts of diagnostic contact lens kits, decrease the amount of chair time and follow-up visits, and to increase the likelihood of successful dispensing of toric soft contact lenses. CooperVision's ToriTrack software was evaluated to determine the likelihood of successful empirical fitting when using this software program to order contact lenses instead of traditional diagnostic fitting. Method: This was a study performed at Pacific University College of Optometry with 19 subjects, who had at least 1 Diopter of cylinder in their spectacle prescription. Their spectacle corrected visual acuity was measured through trial frame and then a corneal topography was done to determine their oblique visible iris diameter and their simulated keratometric reading. 32 subject eyes were fitted with toric soft contact lenses using CooperVision's ToriTrack software to select the appropriate contact lens. The subjects contact lens visual acuity was measured and the fit was assessed. Results: The study showed 83.3% of eyes (25 eyes) achieved a successful fit in terms of obtaining the same or better visual acuity than their habitual glasses prescription. This study also demonstrates a 93.4% (30 eyes) success rate in achieving an acceptable fit. Conclusions: It is shown that using software such as ToriTrack is an acceptable method of achieving dispensable fits of toric soft contact lenses.

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