In general, the optimal visual acuity after vision correction with glasses or surgery should be 1.0, but this can be relaxed to 0.8 in case of discomfort such as dizziness. For refractive errors such as myopia, hyperopia, refractive error, etc., vision correction can be done by wearing corneal contact lenses, framed glasses, or through surgery, etc. Usually the corrected visual acuity needs to be normal, i.e., around 1.0. If the corrected visual acuity cannot reach 1.0 due to physiological factors such as development, or if dizziness, nausea and other discomforts occur after correcting the vision to 1.0 by wearing glasses, the range of vision correction can be relaxed to 0.8. Therefore, a vision between 0.8 and 1.0 after vision correction is normal. It is recommended to go to the hospital in time to see a doctor if you have difficulty seeing; the clinician should make a comprehensive judgment as to what kind of vision correction should be used.