A visual acuity of 1.0 after the age of 50 is considered normal, but a visual acuity of 0.5 or higher is usually sufficient for daily life, depending on the eye requirements of the population. Visual acuity is an important indicator of visual acuity, and can usually be measured by using a standardized vision chart. Under normal circumstances, patients over the age of 50 should be able to achieve a naked eye visual acuity of 1.0, which is normal vision and represents the ability to distinguish details of objects projected on the retina at an angle of one degree. If the visual acuity decreases a little, but is above 0.5 visual acuity, it will have little effect on daily life, and the specific visual acuity needs are related to the patient’s eye requirements in life and work. It is recommended that patients with visual abnormalities seek prompt medical attention to assess their condition and follow medical advice.