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2. Specsavers - Wikipedia

   en.wikipedia.org/wiki/Specsavers

   Specsavers Optical Group Ltd is a British multinational optical retail chain, which operates mainly in the UK, Ireland, Australia, New Zealand, Canada, South Africa and the Nordic countries. The chain offers optometry and optician services for eyesight testing and sells glasses , sunglasses , and contact lenses .

3. Lensmeter - Wikipedia

   en.wikipedia.org/wiki/Lensmeter

   13 – Prism scale knob. A lensmeter or lensometer (sometimes even known as focimeter or vertometer), [1] [2] is an optical instrument used in ophthalmology. It is mainly used by optometrists and opticians to measure the back or front vertex power of a spectacle lens and verify the correct prescription in a pair of eyeglasses, to properly ...

4. Prism (optics) - Wikipedia

   en.wikipedia.org/wiki/Prism_(optics)

   Prism (optics) An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.

5. Phoropter - Wikipedia

   en.wikipedia.org/wiki/Phoropter

   Phoroptor is a registered trademark currently owned by Reichert Technologies, filed Apr 25, 1921, by DeZeng Standard of New Jersey, with the USPTO, serial number 71146698. The word was coined at that time for the newest version of their phoro-optometer. DeZeng was purchased in 1925 by American Optical of Massachusetts, which continued to market ...

6. Adjustable-focus eyeglasses - Wikipedia

   en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

   Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has to change their eye position ...

7. Pince-nez - Wikipedia

   en.wikipedia.org/wiki/Pince-nez

   Pince-nez ( / ˈpɑːnsneɪ / or / ˈpɪnsneɪ /, plural form same as singular; [1] French pronunciation: [pɛ̃sˈne]) is a style of glasses, popular in the late 19th and early 20th centuries, that are supported without earpieces, by pinching the bridge of the nose. The name comes from French pincer, "to pinch", and nez, "nose".