There is no necessary correlation between visual acuity and prescription. With a visual acuity of 0.8, you need to go to the hospital for further examination to determine the prescription. Although there is a link between visual acuity and prescription, i.e. the lower the visual acuity, the higher the number of corrective lenses needed, there is no clear correspondence between the two. For patients with the same visual acuity, the number of myopia correcting lenses will be different if they have different eye adjustments. The normal visual acuity for adults is 1.0 or more, and a visual acuity of 0.8 may be due to improper eye use in general. For those who need to wear eyeglasses if necessary, it is recommended to go to the ophthalmology department of the hospital for an examination to test the visual acuity, refractive error, pupil distance, fundus, etc., and then wear eyeglasses for vision correction under the guidance of the doctor, and have a recheck at least once every three months. In addition, attention should be paid to the protection of eyesight in daily life, to avoid long-term visual fatigue, appropriate exercise, ensure adequate sleep, eye massage, pay attention to eye hygiene and so on. If you find any abnormalities in your vision, you should go to the hospital for treatment.