LENS - Same as the crystalline lens. Double convex, clear part of the eye, behind the iris and in front of the vitreous humor. Serves to refract the various rays of light to form an image on the retina MACULAR DEGENERATION - Disease of the macula, which results in the loss of central vision MICROKERATOME - Mechanical surgical device that is affixed to the eye by use of a vacuum ring. When secured, a very sharp blade cuts a layer of the cornea at a predetermined depth. MONOVISION - Purposeful adjustment of one eye for near vision and the other eye for distance vision MYOPIA - Also called nearsightedness or shortsightedness, the inability to see distant objects as clearly as near objects NEARSIGHTED - Common term for myopia NORMAL VISION - Occurs when light is focused directly on the retina rather than in front or behind it OCULOPLASTICS - refers to a wide variety of surgical procedures that deal with the orbit (eye socket), eyelids, tear ducts and the face. It also deals with the reconstruction of the eye and associated structures. OPHTHALMOLOGIST - A physician (doctor of medicine or doctor of osteopathy) who specializes in the refractive, medical and surgical care of the eyes and visual system and in the prevention of eye disease and injury. The ophthalmologist has completed four or more years of college premedical education; four or more years of medical school; and four or more years of residency, including at least three years of residency in ophthalmology. OPTICIAN - Expert who designs, verifies and dispenses lenses, frames and other fabricated optical devices upon the prescription of an ophthalmologist or an optometrist 64