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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. Blind (poker) - Wikipedia

   en.wikipedia.org/wiki/Blind_(poker)

   In online poker, blinds range from as little as one U.S. cent to USD1,000 or more. The minimum and maximum buy-in at a table is usually set in relation to the big blind. At live games, the minimum buy-in is usually between 50 and 80 big blinds, while the maximum buy-in is usually between 100 and 250 big blinds.

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).

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6. Abacus - Wikipedia

   en.wikipedia.org/wiki/Abacus

   Although blind students have benefited from talking calculators, the abacus is often taught to these students in early grades. [61] Blind students can also complete mathematical assignments using a braille-writer and Nemeth code (a type of braille code for mathematics) but large multiplication and long division problems are tedious. The abacus ...

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