A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the...

famous reversible photochromic applications is color changing lenses for sunglasses. The largest limitation in using photochromic technology is that...

flip-up glasses which feature a dark lens that can be flipped up when not in use (see below). Photochromic lenses gradually darken when exposed to ultraviolet...

produce lenses with flat surfaces, or lenses that do not have the aberrations typical of traditional spherical lenses. Gradient-index lenses may have...

anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses, other optical elements, and photovoltaic cells to reduce reflection. In...

must be for a minimum of one year. Contact lens Dioptre Eyeglass prescription Lorgnette Monocle Photochromic lens Pince-nez Visual acuity Keay L, Friedman...

F-number Gravitational lens Lens (anatomy) List of lens designs Numerical aperture Optical coatings Optical lens design Photochromic lens Prism (optics) Ray...

high-quality flashlights use borosilicate glass for the lens. This increases light transmittance through the lens compared to plastics and lower-quality glass....

Hydrogen darkening Optical amplifier Optical fiber Optical lens design Photochromic lens Photosensitive glass Refraction Transparent materials Surface...

high refractive index is useful for lens making, since a given focal length can be achieved with a thinner lens. However, the dispersion must be corrected...