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Schirmer's test determines whether the eye produces enough tears to keep it moist. This test is used when a person experiences very dry eyes or excessive watering of the eyes. It can cause damage to the cornea. [1] A negative (more than 10 mm of moisture on the filter paper in 5 minutes) test result is normal.
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.
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/ ...
The chart was designed by Ian Bailey [5] and Jan E. Lovie-Kitchin at the National Vision Research Institute of Australia. [1] [3] They described their motivation for designing the LogMAR chart as follows: "We have designed a series of near vision charts in which the typeface, size progression, size range, number of words per row and spacings were chosen in an endeavour to achieve a ...
A patient is at risk of developing dry eye and if the OPI is < 1.0. [8] Dry eye may occur in certain environmental conditions or while performing certain visual tasks like computer use movie watching etc. [9] [10] Calculating ocular protection index may be useful in these conditions also. For example, If a person's TBUT is 15 seconds which is ...
Doctors explain which blood type is more susceptible to norovirus, also known as the 24-hour flu and stomach bug. Plus, how one gene mutation helps protect from it.
Editor’s Note: Help is available if you or someone you know is struggling with suicidal thoughts or mental health matters. In the US: Call or text 988, the Suicide & Crisis Lifeline.
This page was last edited on 9 November 2022, at 20:57 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.