Bifocal (double focus) lens
Lenses that correct two vision problems at once, such as myopia and difficulty reading. A segment of the lens’s lower part is used for near vision, the rest of the lens for far. The post Bifocal...
View ArticleCorrective lens
A corrective lens corrects vision defects. It results in a combination of materials, optical surfaces and treatments. The post Corrective lens appeared first on Greiche & Scaff.
View ArticleMineral lens
Made from silicon and a combination of different oxides fused at high temperatures. They are scratch-resistant and can be “photochromic.” They are heavy and breakable, but have the advantage of being...
View ArticleMultifocal lenses
Bi- and multifocal lenses that correct more than one vision problem at time, such as myopia and difficulty reading. The post Multifocal lenses appeared first on Greiche & Scaff.
View ArticleOrganic lenses
Organic lenses are manufactured from “polymerized” resin and are of very high optical quality. Twice as light as mineral lenses, they are shock-resistant and can be coloured and photochromic. They are,...
View ArticlePhotochromic lenses
Lenses that automatically change from clear to dark in the presence of ultraviolet (UV) radiation. The post Photochromic lenses appeared first on Greiche & Scaff.
View ArticleProgressive lenses
Bifocal or multifocal lenses with no visible lines. Lenses designed to correct presbyopia whose powers change progressively between the upper portion, intended for distance vision, and the lower,...
View ArticleSingle vision lenses
Single-focus lenses used to correct ametropia. They can also be used to correct presbyopia, but will only make near vision clearer; distance vision will be blurred. The power is the same at each point...
View ArticlePeripheral vision
Ability to see objects on the periphery, without looking at them directly. A number of problems can lead to loss of peripheral vision, including glaucoma, brain seizures, optic nerve damage (ischemic...
View ArticleStereoscopic vision
Ability to see objects in three dimensions. Stereoscopic vision is largely due to the binocular neurons located in the part of the cerebral cortex that processes visual information (V1). These...
View Article
