How to Tell if Your Contact Lenses Are Ready to Be Changed

 Contact lenses need to be right side up to fit correctly in the eye. Hard plastic contact lenses date back to 1936, yet consumers have largely replaced wearing them with soft contact lenses. Soft contact lenses have been available commercially since 1971. They are more comfortable than hard contact lenses, given that they are made of thinner, more pliable material. The main issues with wearing hard or soft contact lenses are dryness, cleanliness and slippage.

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