Definition of Lenses. Meaning of Lenses. Synonyms of Lenses

Here you will find one or more explanations in English for the word Lenses. Also in the bottom left of the page several parts of wikipedia pages related to the word Lenses and, of course, Lenses synonyms and on the right images related to the word Lenses.

Definition of Lenses

Lenses
Lens Lens (l[e^]nz), n.; pl. Lenses (-[e^]z). [L. lens a lentil. So named from the resemblance in shape of a double convex lens to the seed of a lentil. Cf. Lentil.] (Opt.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure. Lenses Note: Of spherical lenses, there are six varieties, as shown in section in the figures herewith given: viz., a plano-concave; b double-concave; c plano-convex; d double-convex; e converging concavo-convex, or converging meniscus; f diverging concavo-convex, or diverging meniscus. Crossed lens (Opt.), a double-convex lens with one radius equal to six times the other. Crystalline lens. (Anat.) See Eye. Fresnel lens (Opt.), a compound lens formed by placing around a central convex lens rings of glass so curved as to have the same focus; used, especially in lighthouses, for concentrating light in a particular direction; -- so called from the inventor. Multiplying lens or glass (Opt.), a lens one side of which is plane and the other convex, but made up of a number of plane faces inclined to one another, each of which presents a separate image of the object viewed through it, so that the object is, as it were, multiplied. Polyzonal lens. See Polyzonal.

Meaning of Lenses from wikipedia

- material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such...
- Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over...
- in some cases if multifocal IOLs, trifocal IOLs or EDOF lenses are used. Intraocular lenses have been used since 1999 for correcting larger errors in...
- Trifocals are eyegl****es with lenses that have three regions which correct for distance, intermediate (arm's length), and near vision. John Isaac Hawkins...
- quality of the lens, which is why precise imaging applications such as photography usually still use larger conventional lenses. Fresnel lenses are usually...
- m**** production. Typical rectilinear lenses can be thought of as "improved" pinhole "lenses". As shown, a pinhole "lens" is simply a small aperture that blocks...
- Progressive lenses are corrective lenses used in eyegl****es to correct presbyopia and other disorders of accommodation. They are characterised by a gradient...
- multitude of lens shapes. For lower power lenses, there are few restrictions, allowing for many trendy and fashionable shapes. Higher power lenses can distort...
- Sony E-mount Lens) lenses for Sony E-mount cameras since 2010. They are also compatible with H****elblad E-mount cameras. Some of the lenses introduced into...
- sufficiently protective lenses can block much or little light, resulting in dark or light lenses. The lens color is not a guarantee either. Lenses of various colors...