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  2. Orthokeratology - Wikipedia

    en.wikipedia.org/wiki/Orthokeratology

    Orthokeratology lens. Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS), is the use of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia ...

  3. Even With 20/20 Vision, I Wear These Glasses Every Day - AOL

    www.aol.com/even-20-20-vision-wear-120000167.html

    The blue light glasses from Caddis are a game-changer for anybody who uses a smart device. Inside, an editor's honest review of blue light filtering lenses. Even With 20/20 Vision, I Wear These ...

  4. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 metres or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart. [9] Vision of 6/12 corresponds to lower performance, while vision of 6/3 to better ...

  5. Visual impairment - Wikipedia

    en.wikipedia.org/wiki/Visual_impairment

    Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]

  6. Osteo-odonto-keratoprosthesis - Wikipedia

    en.wikipedia.org/wiki/Osteo-odonto-keratoprosthesis

    2-year functional survival (visual acuity better than 1.30 logMAR or 20/400 Snellen): 63% for OOKP and 49% for OKP; 10-year functional survival (visual acuity better than 1.30 logMAR or 20/400 Snellen): 38% for OOKP and 17% for OKP [6] Another long-term study of 181 patients puts the chances of retaining an intact OOKP after 18 years at 85%. [7]

  7. Optics and vision - Wikipedia

    en.wikipedia.org/wiki/Optics_and_vision

    Glasses (also called eyeglasses or spectacles) are frames bearing lenses worn in front of the eyes, normally for vision correction, eye protection, or for protection from UV rays. Modern glasses are typically supported by pads on the bridge of the nose and by temple arms placed over the ears .

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