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Amsler grid, Chart 1 There are 7 types of Amsler grid charts. All charts measure 10 cm × 10 cm (3.9 in × 3.9 in), which when viewed at a distance of 33 cm (13 in) from the eye can be used to measure defects in the central 20 degrees of the visual field .
A cataract is a cloudy area in the lens of the eye that leads to a decrease in vision of the eye. [1] [7] Cataracts often develop slowly and can affect one or both eyes. [1] Symptoms may include faded colours, blurry or double vision, halos around light, trouble with bright lights, and difficulty seeing at night. [1]
Nonetheless, cataracts tend to have a greater financial and emotional toll upon children as they must undergo expensive diagnosis, long term rehabilitation, and visual assistance. [58] Also, according to the Saudi Journal for Health Sciences, sometimes people experience irreversible amblyopia [ 56 ] after pediatric cataract surgery because the ...
Charts for vision - •Distant vision: to determine visual acuity of distant vision ••Snellen's distant vision chart-do-; for those who can read in English ••Regional language charts-do-; for those who can read in their local language ••E Chart-do-; for those who can not read ••Landolt's broken ring chart-do-; for those who can ...
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]
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