Comparative Analysis of Different Lens Materials.

Background: The purpose of this study is to subjectively judge the performance of
polycarbonate lenses to Trivex® lenses in high prescriptions of at least 4 diopters plus or minus or at least 2.5 diopters of cylinder, using survey based subjective analysis. Trivex® and polycarbonate are two lenses that have similar characteristics with the exception of Abbe values, which are 44 and 30 respectively. Attributes measured were thickness, vision quality through central and peripheral portions of lens, importance of impact resistance, and overall rating. 1•2
Mehtods: Subjects wore each type of lens material for 7-10 days. At the end of each period a survey was completed will to examine the performance of the lens material. Following the second trial period each participant also completed a survey comparing the performance of each lens material. Patients were not informed of the specific type of lens material that they are wearing in order to limit the influence of prior knowledge of the results.
Results: Trivex® outperformed polycarbonate in all categories (central/peripheral clarity
and overall rating) with exception of lens thickness. Impact resistance was rated
moderate in the buying decision of subjects in choosing a lens material.
Conclusions: Subjective analysis in this study showed that in patients with higher
prescriptions Trivex® was preferred over polycarbonate for lens material.