hard lens rigid lens
1hard 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 …
2hard 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… …
3hard 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. * * * …
4Rigid gas permeable — lenses are rigid contact lenses made of oxygen permeable polymers. Initially developed in the late 1970s, and through the 1980s and 1990s, they were an improvement over prior hard lenses that restricted oxygen transmission to the eye. Rigid… …
5Contact lens — Contacts redirects here. For the software application, see Address book. A pair of contact lenses, positioned with the concave side facing upward …
6contact 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 …
7contact lens rigid — hard contact l …
8contact 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 …
9Keratoconus — Classification and external resources The conical cornea that is characteristic of keratoconus ICD 10 H …
10industrial glass — Introduction solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties lustre, transparency, and durability make glass a favoured… …
