Explain Visual acuity.
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Visual acuity is the sharpness or clarity of vision, measuring the ability to discern fine details. It is typically assessed by reading letters or symbols on an eye chart at a standard distance. The result is expressed as a fraction, with the numerator indicating the distance at which the test is conducted and the denominator representing the average distance at which a person with normal vision can read the same line. Higher visual acuity corresponds to better vision, while lower acuity may indicate visual impairment. Regular eye examinations often include tests to assess visual acuity.