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2. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   The largest letter on an eye chart often represents an acuity of 6/60 (20/200), the value that is considered "legally blind" in the US. Many individuals with high myopia cannot read the large E without glasses, but can read the 6/6 (20/20) line or 6/4.5 (20/15) line with glasses. By contrast, legally blind individuals have a visual acuity of 6/ ...

3. SeeAbility - Wikipedia

   en.wikipedia.org/wiki/SeeAbility

   SeeAbility (formerly School for the Indigent Blind and Royal School for the Blind) is a UK charity that provides support and campaigns for better eye care for people with learning disabilities, autism and sight loss.

4. Visual field - Wikipedia

   en.wikipedia.org/wiki/Visual_field

   The blind spot can also be assessed via holding a small object between the practitioner and the patient. By comparing when the object disappears for the practitioner, a subject's blind spot can be identified. There are many variants of this type of exam (e.g., wiggling fingers in the visual periphery on the cardinal axes).

5. Optic cup (anatomical) - Wikipedia

   en.wikipedia.org/wiki/Optic_cup_(anatomical)

   The cup-to-disc ratio (often notated CDR) is a measurement used in ophthalmology and optometry to assess the progression of glaucoma.The optic disc is the anatomical location of the eye's "blind spot", the area where the optic nerve leave and blood vessels enter the retina.

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. 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]