How much is 4.9?

Normal adults whose naked eye vision reaches 5.0 belong to normal, and those below 5.0 belong to vision decline. 4.9 The decline of vision is relatively not very serious, but there is a disproportionate relationship between naked eye vision and myopia. Myopia, astigmatism, hyperopia, cataract or fundus disease and other reasons can cause vision decline. It is recommended to go to the hospital in time for optometry examination, slit lamp examination and fundus examination to clarify the cause. After optometry examination can be clear whether there is myopia, at the same time can be clear about the specific degree of myopia, need to consider whether to wear glasses according to the results of optometry, for mild myopia within 100 degrees, do not need to wear glasses can adjust to normal vision, but need to develop good eye habits to control the degree of continuous growth.