The aim of this study is to analyse the effect of dehydration of two contact lenses – LC - (daily replacement hydrogel - Hioxifilcon A and monthly replacement silicone-hydrogel - Asmofilcon A) on their optical properties (transmittance, absorption and dispersion). Significant differences were found between dehydration levels of Hioxifilcon A and Asmofilcon A contact lenses. Conventional hydrogel lenses dehydrate quickly, which leads to a greater alteration of their optical properties. For both materials, with dehydration reflectance increases due to scattering within the material and transmittance decreases due to increased absorption. These changes are more noticeable for daily LCs of conventional hydrogel.
The aim of this study is to benchmark the optical properties (transmittance, absorption and dispersion) of two different types of contact lenses (daily replacement hydrogel - Hioxifilcon A and monthly replacement silicone-hydrogel - Asmofilcon A) in the visible spectra using the IAD method. Lower transmittance, lower absorption and higher dispersion were found for daily replacement contact lenses - Hioxifilcon A - than for monthly replacement contact lenses - Asmofilcon A. As diopter powers increase for both type of lenses, transmittance and absorption decrease and dispersion increases, which may have implications on the visual performance of these contact lenses.
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