eyeglasses

Definition of eyeglasses in English English dictionary: plural form of eyeglass; spectacles, glasses; n kacamata (kaca); {i} set of lenses attached to a frame and used improve vision, glasses, spectacles; plural of eyeglass; Also called spectacles, eyeglasses are the most common device for the correction of vision problems including hyperopia (farsightedness), myopia (nearsightedness), astigmatism (corneal distortion) and presbyopia (inability of eye to focus up close due to hardening of natural lens) The most common types of eyeglass lenses are single vision, bifocals, trifocals and multi-focals (progressive lenses) Eyeglass lens materials include glass and various types of plastic, including new materials that allow thinner, lighter-weight lenses Various treatments to the lenses include antireflection coating, photochromic (which darken when exposed to sunlight), polarized and toughened (for safety) See Prescription Eyeglasses in Eye Care Encyclopedia See Free Eye Tests; optical instrument consisting of a pair of lenses for correcting defective vision; Eyeglasses are two lenses in a frame that some people wear in front of their eyes in order to help them see better. Lenses set in frames to wear in front of the eyes to aid vision or correct vision defects (see ophthalmology, optometry). Their use for farsightedness and nearsightedness has been known since the late Middle Ages. In 1784 Benjamin Franklin invented bifocals, with divided lenses for distant and near vision. Eyeglasses can also correct astigmatism. Most lenses are made of glass or plastic (lighter and more shatterproof than glass but easily scratched). Sunglass lenses are tinted to reduce glare and often treated to reduce ultraviolet light exposure. See also contact lens; spectacles; lenses ground to the specifications of a prescription which, when mounted into frames and worn on the face, aid in refocusing the light entering each eye onto the retina at the back of the eye, providing clear vision; A term commonly used to describe an ophthalmic frame with lenses inserted; {i} spectacles
eyeglass: a monocle
pair of eyeglasses: A pair of lenses set in a frame worn on the nose and ears in order to correct deficiencies in eyesight or to ornament the face
eyeglass: {n} a glass used to hep the sight, in telescopes, the glass next to the eye
eyeglass: A lens of glass to assist the sight
eyeglass: Eyeglasses are used singly or in pairs
eyeglass: A glass eyecup
eyeglass: a lens, especially one of a pair
eyeglass: The retina
eyeglass: Eyepiece of a telescope, microscope, etc
eyeglass: lens for correcting defective vision in one eye; held in place by facial muscles
eyeglass: an eyepiece
eyeglass: {i} monocle, eyepiece