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Letters Dictionary Terms
Snellen letter
The letter form used on visual performance test charts. The overall letter height is equal to five times the thickness of individual strokes. Normal 20/20 vision is represented by the ability to distinguish snellen letters that subtend an overall...
optical character reader
A photosensitive device used to optically scan and read character data (numbers, letters etc.) and input this data into a...
Rockwell hardness
Rockwell hardness (Rc) refers to a method for measuring the hardness of a material, primarily metals, using an indentation...
visual test chart
A series of high contrast block letters or similar objects arranged to permit the evaluation of eyesight in humans.
alphanumeric display
A luminous display of numbers and the letters of the alphabet.
(5 results found)
May 2024
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