Base curve — is the measure of the general shape of a lens. On a spectacle lens, it is the curvature of the front surface and on a contact lens it is the curvature of the back surface. See corrective lenses for more on spectacle base curve of ophthalmic… … Wikipedia
Radius of curvature (optics) — Radius of curvature has specific meaning and sign convention in optical design. A spherical lens or mirror surface has a center of curvature located in (x, y, z) either along or decentered from the system local optical axis. The vertex… … Wikipedia
Nantenbach Curve — Line number: 5216 Line length: 11.3[1] Gauge: 1435 … Wikipedia
Algebraic curve — In algebraic geometry, an algebraic curve is an algebraic variety of dimension one. The theory of these curves in general was quite fully developed in the nineteenth century, after many particular examples had been considered, starting with… … Wikipedia
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
BC — or B.C. may refer to: * Before Christ, from the Latin Ante Christum , an epoch based on the traditionally reckoned year of the conception or birth of Jesus Christ.Places* British Columbia, Canada s westernmost province * Baja California, Mexico s … Wikipedia
BCR — may refer to: * B cell receptor * Ball closure ring, a form of body piercing jewelry *Base curve radius, a parameter of a contact lens *BCR gene *BCR (Belfast Community Radio) a radio station that broadcast in Belfast, Northern Ireland.… … Wikipedia
Corrective lens — A bifocal corrective eyeglass lens A pair of contact le … Wikipedia
Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations … Wikipedia
Dongjiang Dam — For the concrete face rock fill dam on the Beipan River in Guizhou, see Dongqing Dam. Dongjiang Dam … Wikipedia
