If a patient has blurry eyes, it may be caused by ophthalmic diseases, such as refractive errors, cataracts, iridocyclitis, and may also be caused by visual fatigue. Refractive error is caused by developmental abnormalities or poor eye habits, etc., resulting in the refractive system of the eye can not accurately focus the light on the retina and caused by three types of myopia, hyperopia, astigmatism, patients may experience blurred vision, vision distortion and other discomforts. Cataracts, on the other hand, are caused by aging and other factors that cause the lens to become cloudy, blocking light from entering the eye, which can lead to blurred vision. Iridocyclitis is caused by an autoimmune reaction that leads to inflammation inside the eye, affecting the patient’s vision due to clouding of the aqueous humor. Patients with visual fatigue may experience blurred vision, soreness and dryness of the eyes due to prolonged close eye use. It is recommended that patients with blurred vision and other discomforts seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.