Illinois Vision Certification Practice Test

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Prepare for the Illinois Vision Certification Test. Master key concepts with flashcards and multiple choice questions that include hints and explanations. Boost your confidence and ace your exam!

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True or False: Visual acuity in Snellen notation is denoted as number of feet from target divided by size of symbols identified.

True
False
Only for adults
Only for children

The correct answer is: False

The statement regarding visual acuity in Snellen notation is indeed false. Snellen notation quantifies visual acuity by comparing the distance at which a person can identify a series of symbols, typically letters, to the distance at which a person with normal vision can identify the same symbols. While it is expressed as a fraction, it is not accurately described as "number of feet from target divided by size of symbols identified" in the straightforward sense. In Snellen notation, the first number indicates the distance of the vision test (commonly 20 feet in the United States), and the second number indicates the size of the letters or symbols that the person can accurately identify at that distance. For instance, 20/20 vision means the person can see at 20 feet what the average person can see at that distance. Misunderstanding this notation can lead to confusion regarding the measurements and interpretation involved in visual acuity assessments.