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  2. 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 ...

  3. Lighting for the elderly - Wikipedia

    en.wikipedia.org/wiki/Lighting_for_the_elderly

    Lighting systems can help seniors maintain balance and stability. [25] Furthermore, sleep deprivation can contribute to decreased postural control. [ 26 ] [ 27 ] Nightlights that accent horizontal and vertical spaces, such as soft lighting above a doorway or at the foot of a bed, can reduce the risk of falls without disturbing sleep.

  4. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity . Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor ...

  5. A new surgery can give legally blind people 20/20 vision - AOL

    www.aol.com/news/2016-12-15-a-new-surgery-can...

    Within a few months, almost all patients went from having an average of 20/1290 vision to 20/20 vision! Even more amazing, the amount of time between the trauma and the treatment didn't seem to ...

  6. The AOL.com video experience serves up the best video content from AOL and around the web, curating informative and entertaining snackable videos.

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

    www.aol.com/lifestyle/even-20-20-vision-wear...

    Even With 20/20 Vision, I Wear These Glasses Every Day. Trishna Rikhy. June 21, 2023 at 8:00 AM. ... Video shows man rescuing two dogs from frigid lake: 'We had to get them' Sports.

  8. Eye chart - Wikipedia

    en.wikipedia.org/wiki/Eye_chart

    An example of the Landolt C eye chart (also known as the Japanese eye chart.). Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision, while the ETDRS chart is designed for use at 4 meters. [16]

  9. Near visual acuity - Wikipedia

    en.wikipedia.org/wiki/Near_visual_acuity

    Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters.Visual acuity in general usually refers clarity of distance vision, and is measured using eye charts like Snellen chart, LogMAR chart etc. Near vision is usually measured and recorded using a printed hand-held card containing different sized paragraphs, words, letters or symbols.

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    20 12 vision explained in detail video for seniors printable free