There are many causes of blurred vision in the eyes. Generally for children and young patients, if the symptoms of blurred vision gradually appear, most of the refractive error is still considered to be caused by, for example, myopia deepening, different degrees of vision loss in both eyes is more common, but monocular is also not uncommon. Usually consider going to the hospital ophthalmology department for medical optometry can be a clear diagnosis, if children and adolescents, but also need to dilate the pupil optometry. It is recommended that glasses be worn in a timely manner to correct the problem. If there is a sudden onset of blurred vision, and the vision loss is quite obvious, and there are no other symptoms of discomfort in the eyes, it may be related to the accumulation of blood in the vitreous cavity, retinal detachment, central retinal artery obstruction, central retinal vein obstruction and so on. If vision loss occurs gradually and there are no other symptoms, it may be caused by fundopathy or senile cataract. If the blurred vision is accompanied by obvious congestion and pain, it may be due to keratitis, uveitis or glaucoma. If it is a transient blurring of vision, it may also be visual fatigue, dry eye, migraine, central retinal artery spasm, hysteria and so on. Therefore, if there is blurred vision in the eyes, it is still recommended to timely hospital ophthalmology routine examination. According to the results of the examination for symptomatic treatment.