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  2. Rigid gas permeable lens - Wikipedia

    en.wikipedia.org/wiki/Rigid_gas_permeable_lens

    A rigid gas-permeable lens, also known as an RGP lens, GP lens, or colloquially, a hard contact lens, is a rigid contact lens made of oxygen -permeable polymers. Initially developed in the late 1970s, and through the 1980s and 1990s, they were an improvement over prior 'hard' lenses that restricted oxygen transmission to the eye.

  3. Essilor - Wikipedia

    en.wikipedia.org/wiki/Essilor

    Essilor International is an international ophthalmic optics company that designs, manufactures and markets lenses to correct or protect eyesight. [1] Its headquarters is in Charenton-le-Pont (near Paris), France . It is the world's largest manufacturer of ophthalmic lenses. [2]

  4. Optics and vision - Wikipedia

    en.wikipedia.org/wiki/Optics_and_vision

    Glasses or "spectacles" are corrective lenses worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye. Intraocular lenses are surgically implanted most commonly after cataract removal, but recently for purely refractive purposes. Myopia (short sightedness) requires a divergent lens ...

  5. Clearly - Wikipedia

    en.wikipedia.org/wiki/Clearly

    Clearly is an online retailer of contact lenses, eyeglasses and sunglasses. The company was acquired by EssilorLuxottica Canada, and is headquartered in Vancouver, British Columbia. They are one of the largest online contact lens retailers in North America, and the largest seller of prescription eyeglasses online in the world. History