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The effect of lens wear on refractive index of conventional hydrogel and silicone-hydrogel contact lenses: a comparative study.
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Abstract
The purpose of this work was to evaluate the ability of four silicone-hydrogel contact lenses (galyfilcon A, balafilcon A, lotrafilcon A and lotrafilcon B) to retain their equilibrium water content before and after wear, through measurements of refractive index and compare with that of a conventional disposable hydrogel contact lens (etafilcon A).