If you notice any results that fall outside these standards, be sure to schedule an eye exam with your Vision Source doctor. Older children and adults should be able to read the majority of letters on the 20/20 line. A 3- to 4-year-old should be able to read the 20/40 line, and a 5-year-old the 20/30 line. That depends on the age of the person being tested.
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