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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 Franciscus Cornelius Donders .
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.
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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Sloan letters, designed by Louise Sloan in 1959, are a set of optotypes used to test visual acuity generally used in Snellen charts and logMAR charts. This set of optotypes consists of ten specially formed "letters", C, D, H, K, N, O, R, S, V and Z. [ 1 ] These letters, unlike the ones used in older Snellen charts, are designed to give acuity ...
The post 20 Printable Sudoku Puzzles to Test Your Smarts appeared first on Reader's Digest. These printable sudoku puzzles are four different levels of difficulty. You want to start with the easy ...
Print/export Download as PDF; ... or Japanese vision test, is an optotype: ... This is identical to the letter C from a Snellen chart. The Landolt C is the standard ...
Printable Crossword Puzzle: September 2017 We've used the names of Snow White's diminutive friends as clues in this crossword. ... 30 Printable Crossword Puzzles to Test Your Smarts. D. J ...
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