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  2. Pupillary distance - Wikipedia

    en.wikipedia.org/wiki/Pupillary_distance

    For people who need to wear prescription glasses, consideration of monocular PD measurement by an optician helps to ensure that the lenses will be located in the optimum position. [6] Whilst PD is an optometric term used to specify prescription eyewear, IPD is more critical for the design of binocular viewing systems, where both eye pupils need ...

  3. Anti-reflective coating - Wikipedia

    en.wikipedia.org/wiki/Anti-reflective_coating

    Anti-reflective coatings are often used in camera lenses, giving lens elements distinctive colors. Such colors indicate the wavelength of visible light least affected by the antireflective properties of the coating. A variety of colors can be produced whose precise hue depends entirely on the thickness of the coating.

  4. Essilor - Wikipedia

    en.wikipedia.org/wiki/Essilor

    Eyezen – Digitally surfaced lens marketed towards users of electronic devices; Xperio – Polarized sunglass lens; Optifog – Fog resistant lens technology; Stellest – Lens targeted towards young children, designed to slow the progression of myopia. Orma – Essilor's branding of the CR-39 lens material.

  5. Circle contact lens - Wikipedia

    en.wikipedia.org/wiki/Circle_contact_lens

    Circle contact lens. A circle contact lens, also known as a big eye contact lens and circle lens, is a cosmetic (non-corrective and decorative) contact lens that makes the eye's iris appear larger. It has become a trend throughout East, South and Southeast Asia and is largely produced in Japan, South Korea and China .