![]() ![]() Your eye doctor has other methods of measuring vision in young children or patients who cannot speak or comprehend the visual acuity test. "Normal" distance visual acuity is 20/20. A person with 20/40 visual acuity would have to get within 20 feet of a letter that should be seen clearly at 40 feet. The bottom number is the smallest letter size you were able to read at the 20-foot distance. The top number is the standard distance at which testing is done (20 feet). Visual acuity is written as a fraction, such as 20/40. For the test, you will be asked to read letters on reading charts that are near and at a distance. A doctor of optometry will measure visual acuity to assess how much vision is being affected. In addition, the doctor will note any general health problems, medications, or environmental factors that may be contributing to the symptoms. A doctor of optometry will ask the patient or parent about any current symptoms. ![]() Testing for strabismus, with special emphasis on how the eyes focus and move, may include:
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