The patient’s eyes are always blurred, which may be caused by visual fatigue, conjunctivitis, keratitis, etc. The patient should consult the doctor in time to find out the cause of the disease. 1. Visual fatigue: If patients often stay up late, overuse their eyes, look at cell phones and computers for a long time, visual fatigue can occur and patients may have blurred vision. 2. Conjunctivitis: Conjunctivitis is caused by infection, physical and chemical stimulation or immune response, etc. Under the stimulation of inflammation, patients may experience blurring of the eyes, foreign body sensation, increased secretion, pain, conjunctival congestion and other uncomfortable symptoms. 3. Keratitis: when the cornea’s defense ability is weakened, its own disease or external pathogens and other factors, can cause corneal inflammation reaction, resulting in corneal clouding, the patient may appear blurred vision, accompanied by eye pain, redness and swelling, photophobia and tearing, vision loss and other uncomfortable symptoms. It is recommended that patients with blurred vision seek prompt medical attention to assess their condition and follow the doctor’s instructions for treatment.