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2. Optics and vision - Wikipedia

   en.wikipedia.org/wiki/Optics_and_vision

   Optics and vision. Vision of humans and other organisms depends on several organs such as the lens of the eye, and any vision correcting devices, which use optics to focus the image. The eyes of many animals contains a lens that focuses the light of its surroundings onto the retina of the eye. This lens is essential to producing clear images ...

3. Lenticular lens - Wikipedia

   en.wikipedia.org/wiki/Lenticular_lens

   Corrective lenses. Lenticular lenses are sometimes used as corrective lenses for improving vision. A bifocal lens could be considered a simple example. Lenticular eyeglass lenses have been employed to correct extreme hyperopia (farsightedness), a condition often created by cataract surgery when lens implants are not possible.

4. Myodisc - Wikipedia

   en.wikipedia.org/wiki/Myodisc

   Myodisc. A myodisc or myopic disk is a corrective lens with a steep concave curvature that is fitted on the posterior surface of a carrier lens, or a high power single-vision lens specially ordered with slab-off the edge, creating a central prescription disc. These are used for correction of extremely high myopia often seen in low vision ...

5. Acanthamoeba keratitis - Wikipedia

   en.wikipedia.org/wiki/Acanthamoeba_keratitis

   1.2–3 million people per year; 1 per 10,000 contact wearers [1] Acanthamoeba keratitis ( AK) is a rare disease in which amoebae of the genus Acanthamoeba invade the clear portion of the front ( cornea) of the eye. It affects roughly 100 people in the United States each year. [2] Acanthamoeba are protozoa found nearly ubiquitously in soil and ...

6. Aphakia - Wikipedia

   en.wikipedia.org/wiki/Aphakia

   Aphakia. Aphakia is the absence of the lens of the eye, due to surgical removal, such as in cataract surgery, a perforating wound or ulcer, or congenital anomaly. It causes a loss of ability to maintain focus ( accommodation ), high degree of farsightedness ( hyperopia ), [1] and a deep anterior chamber. Complications include detachment of the ...

7. Essilor - Wikipedia

   en.wikipedia.org/wiki/Essilor

   Vision Direct, formerly Vision Direct Group Ltd , is an online optical retailer that sells contact lenses, solutions and eye care products. Founded in 2004 as Optical Partners plc (unlisted), a small High Street retail business headed by Michael Kraftman, [59] the company is based in the United Kingdom but also operates in the United States ...