contact lenses

contact lenses
lenses worn directly against the eye, separated from it only by a film of tear fluid. Corneal microlenses cover only the cornea, while haptic lenses cover some of the surrounding sclera as well. Contact lenses are used mainly in place of glasses to correct long- and short-sightedness and other errors of refraction, but bandage contact lenses may be used in a protective capacity to relieve the pain of a damaged cornea or as part of the treatment of some types of corneal disease. Contact lenses may be made of hard or soft materials, which have very different properties. Hard Perspex lenses have been partly replaced by gas-permeable lenses, which allow oxygen to pass from the atmosphere to the cornea.

Medical dictionary. 2011.

Look at other dictionaries:

  • contact lenses — lenses worn directly against the eye, separated from it only by a film of tear fluid. Corneal microlenses cover only the cornea, while haptic lenses cover some of the surrounding sclera as well. Contact lenses are used mainly in place of glasses …   The new mediacal dictionary

  • Contact lenses — Lentilles de contact Verres de contact posés avec la face concave vers le haut …   Wikipédia en Français

  • contact lenses — small plastic lenses placed directly on the eyes to correct a vision problem (used instead of eyeglasses) …   English contemporary dictionary

  • Линзы Контактные (Contact Lenses) — линзы, надеваемые непосредственно на глаз и отделенные от него лишь тонкой пленкой слезной жидкости. Роговичные микролинзы (corneal microlenses)закрывают лишь роговицу глаза, в то время как тактильные линзы (haptic lenses) закрывают также и… …   Медицинские термины

  • hard contact lenses — small non permeable plastic lenses worn on the eye for correcting vision …   English contemporary dictionary

  • soft contact lenses — optical lenses made of a soft material …   English contemporary dictionary

  • Father of Modern Contact Lenses — Otto Wichterle …   Eponyms, nicknames, and geographical games

  • contact — [ kɔ̃takt ] n. m. • 1586; didact. av. XIXe; lat. contactus, rac. tangere « toucher » → tact 1 ♦ Position, état relatif de corps qui se touchent. Contact fugitif, prolongé. Certaines maladies se communiquent par contact direct. ⇒ contagieux.… …   Encyclopédie Universelle

  • contact lens — contact lenses N COUNT: usu pl Contact lenses are small plastic lenses that you put on the surface of your eyes to help you see better, instead of wearing glasses …   English dictionary

  • Contact lens — Contacts redirects here. For the software application, see Address book. A pair of contact lenses, positioned with the concave side facing upward …   Wikipedia

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