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2. Hoya Corporation - Wikipedia

   en.wikipedia.org/wiki/Hoya_Corporation

   Hoya Corporation (Hoya株式会社, Hōya Kabushiki-gaisha) is a Japanese company manufacturing optical products such as photomasks, photomask blanks and hard disk drive platters, contact lenses and eyeglass lenses for the health-care market, [4] medical photonics, [5] lasers, photographic filters, medical flexible endoscopy equipment, and software.

3. Progressive lens - Wikipedia

   en.wikipedia.org/wiki/Progressive_lens

   Different designs of progressive lenses have more or less of this distortion. Fitting: Progressive lenses require careful placement relative to the wearer's pupil centre for a distance-viewing reference position. Incorrect specification of the fitting location can cause problems for the wearer including (depending on the design of the lens ...

4. Aspheric lens - Wikipedia

   en.wikipedia.org/wiki/Aspheric_lens

   The reading portion is an aspheric "progressive add". Also, in aphakia or extreme hyperopia, high plus power aspheric lenses can be prescribed, but this practice is becoming obsolete, replaced by surgical implants of intra-ocular lenses. Many convex types of lens have been approved by governing agencies regulating prescriptions.

5. Japanese lens maker Hoya halts production after cyberattack - AOL

   www.aol.com/news/japanese-lens-maker-hoya-halts...

   TOKYO (Reuters) -Japanese lens maker Hoya Corp on Thursday said the production of several of its products have stopped after a system failure, which was "most likely caused by unauthorised access ...

6. Multifocal lens - Wikipedia

   en.wikipedia.org/wiki/Multifocal_lens

   Multifocal lens may refer to: Progressive lens, used in eyeglasses; Multifocal intraocular lens; Multifocal diffractive lens, a diffractive optical element used with ...

7. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   Multifocal contact lenses (e.g. bifocals or progressives) are comparable to spectacles with bifocals or progressive lenses because they have multiple focal points. Multifocal contact lenses are typically designed for constant viewing through the center of the lens, but some designs do incorporate a shift in lens position to view through the ...