Hydra-PEG improves both wettability and lubricity of RGP lenses. Unlike temporary surface treatments such as plasma, the hydrophilicity of the lens was maintained for 12 months of simulated use. These surface properties have been associated with increased patient comfort, both in past studies and in clinical studies performed with Hydra-PEG materials. In addition, this surface coating improved maintenance of the tear film on contact lenses, which could improve visual acuity.
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