”Blurred eyes” is one of the self-perceptions of reduced vision and visual quality. There are many eye diseases that can cause blurred eyes, including refractive error, cataract, keratoconjunctivitis, corneal opacity (opacification, leukoplakia), retinal diseases, trauma, etc. For example, the most common cause of blurred eyes is refractive error, and the simplest way to deal with it is to correct it with accurate prescription lenses after accurate optometry, or to improve it by other means, such as surgery, according to personal wishes. For other conditions, such as keratoconjunctivitis, iridocyclitis, optic nerve optic pathway disease, etc., early medication is needed to alleviate the progression of the disease, and in some cases, surgery may be an option after the disease is effectively controlled. To sum up, the mere manifestation of “blurred eyes” cannot be used as a basis for medical diagnosis and treatment, but needs to be combined with various symptoms and signs to identify and accurately grasp the cause of the disease in order to obtain the best treatment.