A visual acuity of 5.0, commonly known as 1.0, is considered normal. If you realize that you are losing your vision, you should seek medical attention. Visual acuity of 5.0, according to the visual acuity judgment standard, belongs to normal visual acuity, but belongs to the lower limit of normal visual acuity, that is to say, reaches the state of normal visual acuity, but not the best, some people, visual acuity will be higher than 5.0. If you feel that your vision is decreasing, but the measured visual acuity is 5.0, although the visual acuity is normal, but there is a decrease in visual acuity, it is still recommended to further improve the relevant examinations, such as computerized optometry, slit lamp, intraocular pressure and funduscopic examination, in order to exclude the ocular organic lesions, because some ocular lesions in the early stage, may not have much effect on the visual acuity, but they need to be discovered and treated in a timely manner.