Visual acuity, keenness of sight and the ability to distinguish small objects, develops rapidly in infants between the age of three and six months and decreases rapidly as people approach middle age. Good visual acuity is often called 20/20 vision. Optometrists test visual acuity when we have our eyes examined, and poor acuity is often correctable with glasses or contact lenses. As with every other aspect of vision, visual acuity is highly complex, and is influenced by many factors.
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