Why humans see clearly

A transparent cornea is essential for vision, which is why the eye has evolved to nourish the cornea without blood vessels. But for millions of people around the world, diseases of the eye or trauma spur the growth of blood vessels and can …

Dry eye, loss of sensation more common with certain Lasik techniques

Loss of corneal sensation and presence of dry eye signs and symptoms are greater in eyes that have undergone LASIK with a superior-hinged flap ? attached at the top of the cornea ? than in eyes that have received LASIK with a nasal-hinged flap ? attached on the side closest to the nose. This is the conclusion of a study appearing in the May issue of Ophthalmology, the clinical journal of the American Academy of Ophthalmology, the Eye M.D. Association.