ALAIN DEX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY ALAIN DEX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Contact lens fitting. Woman holds a contact lens on her fingertip before fitting it onto her eye. The lens is a thin, shell-like transparent disc made of glass or plastic that fits over the cornea. Contact lenses are worn against the eye, separated by a thin film of fluid. They are used to correct defective vision such as short sight. There are two types of contact lens: hard and soft. Some people cannot use contact lenses as they have sensitive eyes, or difficult optical requirements.
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