Photonics Dictionary: C

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curvature x

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curvature

The measure of departure from a flat surface, as applied to lenses; the reciprocal of radius. Applies to any surface, including lenses, mirrors and image surfaces.

curvature loss -> macrobend loss

In an optical waveguide, that loss attributable to macrobending. Macrobending usually causes little or no radiative loss.

curvature of field

A lens aberration that causes a flat object surface to be imaged onto a curved surface rather than a plane.

center of curvature

The center of the sphere of which the surface of a lens or mirror forms a portion. Each curved surface of a lens has a center of curvature; the surfaces may be convex or concave.

campimeter -> eye test apparatus

Instruments used by ophthalmologists and optometrists to study the eye. There are, for instance, the ophthalmoscope to observe and photograph the retina; the retinoscope and optometer to determine...

centered curve

The surface curvature designed to reduce the marginal error found in the periphery of a spectacle lens.

centered lens system

A lens system in which the centers of curvature of all surfaces fall on a common axis.

centration

In a perfectly centered lens, the mechanical axis (defined by the ground outside the diameter of the lens) is made to be exactly coincident with the optical axis (defined by a line through the...

concentric lens

A lens having surfaces whose centers of curvature coincide.

cylindrical lens

A cylindrical lens is an optical component that has different curvatures along its two orthogonal axes, resulting in a shape resembling a cylinder. Unlike spherical lenses, which have the same...

Photonics DictionaryC

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