The closer you wear myopia, the clearer you can’t see, which may be caused by refractive error and need to be re-tested. If people over 40 years old can’t see clearly, it may be due to the symptoms of presbyopia. Myopia is generally due to abnormal refractive state of the eye, resulting in low vision state, may be due to excessive eye use, bad eye habits and other factors leading to myopia, refraction usually refers to the transmission of light from a medium to another refractive index of different media, the direction of the light will change. Presbyopia belongs to a physiological phenomenon, is not a disease nor refractive error, is a normal presbyopia phenomenon, the crystals in the eye will grow with age, the hardness of the crystals will gradually increase, the ciliary muscle regulation function will gradually decline, the eyes can see things in the distance, but can not see things in the near. When your eyes are nearsighted, you should avoid excessive eye use, stay away from electronic products, take proper rest, and if necessary, wear suitable glasses to improve your vision after examination by a doctor, and do not wear glasses blindly, as this may cause damage to your vision.