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During an eye test, eye doctors use eye charts to measure how well you see in the distance, compared with other human beings. The classic example of an eye chart is the Snellen eye chart, developed by Dutch eye doctor Hermann Snellen in the 1860s.
What is good eyesight and how is it measured ? The 20/20 measurement is actually a very inaccurate measure of your ability to see. In 1862 Dutch ophthalmologist Herman Snellen developed a standard so people had a way of measuring eyesight. Dr. Snellen had an assistant that also was a hunter so he was considered to have good eyesight.
Look up vision in Wiktionary, the free dictionary.
Definition of vision from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.
Visual perception is the ability to interpret the surrounding environment by processing information that is contained in visible light. The resulting perception is also known as eyesight, sight, or vision ( adjectival form: visual, optical, or ocular).
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