The cornea's inner layer of cells.

A cleaner that removes protein deposits and other debris from contact lenses. It's recommended for use either daily, weekly, or monthly. Some enzymatic cleaners are a small tablet dropped into a solution along with the lens; others

The cornea's outer layer of cells.

Currently, these contact lenses are FDA-approved to be worn without removal for up to seven days, meaning some people will be comfortable sleeping with them in their eyes.

Optometrists (O.D.s) and ophthalmologists (M.D.s) both practice eyecare, but in different ways: O.D.s examine eyes to determine eyewear prescriptions and check for and treat many diseases such as glaucoma. M.D.s are medical docto