- contact lens hard
- a contact lens that maintains its shape without support and absorbs little or no water; it may be gas permeable or non–gas permeable. Called also hydrophobic contact l. and rigid contact l.
Medical dictionary. 2011.
contact lens hard
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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
contact lens — one of a pair of small plastic disks that are held in place over the cornea by surface tension and correct vision defects inconspicuously. Cf. hard lens, intraocular lens, soft lens. [1885 90] * * * Thin artificial lens worn on the surface of the … Universalium
contact lens — (also lens) noun ADJECTIVE ▪ gas permeable, hard, soft ▪ daily wear, disposable ▪ extended wear ▪ tinted … Collocations dictionary
contact lens non–gas permeable hard — a contact lens, generally formed of polymethyl methacrylate, that transmits little to no oxygen and carbon dioxide to the cornea. Called also PMMA contact l … Medical dictionary
contact lens PMMA — a contact lens made of polymethyl methacrylate; see non–gas permeable hard contact l … Medical dictionary
contact lens hydrophobic — hard contact l … Medical dictionary
contact lens rigid — hard contact l … Medical dictionary
Lens clock — A lens clock is a mechanical dial caliper that is used to measure dioptric power of a lens. It is a specialized version of a spherometer. A lens clock measures the curvature of a surface, but gives the result in diopters, assuming the lens is… … Wikipedia
hard lens — hard′ lens′ n. oph a contact lens of rigid plastic or silicon, exerting light pressure on the cornea of the eye Compare soft lens … From formal English to slang
hard lens — a contact lens of rigid plastic or silicon, exerting light pressure on the cornea of the eye, used for correcting various vision problems including astigmatism. Cf. soft lens. * * * hard lens, a contact lens made firm plastic that adheres to the… … Useful english dictionary
