Corrected visual acuity of 0.8 means that after the patient has undergone an optometric examination to determine the exact degree of refractive error, and after wearing glasses to correct the error, the patient is able to distinguish the entire line of the visual scale corresponding to 0.8 on the visual acuity chart under the condition of wearing glasses. Under normal circumstances, the corrected visual acuity should reach 1.0. If the corrected visual acuity can only reach 0.8, it means that there is a mild vision loss. The patient should be further examined by an ophthalmologist in the hospital to find out if there are other causes of vision loss, such as cataracts, fundus lesions, etc. Corrected visual acuity (CVA) is a measure of how well a patient can see through the lens. Corrected visual acuity is the result of a visual acuity examination in which the patient wears eyeglasses to remove the refractive error that is affecting his or her vision. It is important to have a full and complete picture of the patient’s vision.