Normally, adults should have a naked eye vision of 5.0 and above, so 4.8 vision is definitely abnormal. But there are many causes of vision loss, including not just one type of myopia. Many diseases can cause vision loss, such as common farsightedness, astigmatism, myopia, eye fatigue, glaucoma, cataracts or certain fundus diseases, all of which may lead to vision loss. Therefore, when the eyesight is lower than normal, you need to go to the hospital early for relevant examinations, including visual acuity examination, intraocular pressure examination, fundus examination, optometry examination, etc. to clarify the specific cause. If it is determined to be myopia, you need to clarify the specific degree after the optometry, and then accurately wear glasses, so that you can maintain a good quality of vision, avoid eye fatigue, and prevent myopia from deepening too quickly.