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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If a child can read only the largest letter on the standard Snellen chart, what would their visual acuity notation be?

20/100
20/50
20/200
20/400

The correct answer is: 20/200

Visual acuity is commonly expressed as a fraction, where the numerator represents the distance at which the test is conducted (typically 20 feet in the United States) and the denominator indicates the smallest size of the letters that can be read at that distance. In the case where a child can only read the largest letter on the standard Snellen chart, this typically corresponds to a visual acuity of 20/200. Having a visual acuity notation of 20/200 means that what a person with normal vision can see at 200 feet, this child can only see at 20 feet. This level of acuity is significant because it is often a threshold used to determine legal blindness in the United States. The other options represent better visual acuity levels. For example, a notation of 20/100 would indicate that the child can see at 20 feet what a person with normal vision would see at 100 feet, while 20/50 would indicate sight equivalent to seeing at 20 feet what a person with normal vision can see at 50 feet. Consequently, 20/400 indicates a more severe impairment than 20/200 and is typically considered to reflect a more profound level of vision impairment.