Blurred vision in one eye may be caused by strabismus, hyperthyroidism, orbital injury, scleritis, etc., which need to be treated with medication or surgery. 1. Strabismus: One eye will be clear and both eyes will be blurred due to the deviation of the visual axis of the other eye when one eye gazes ahead, resulting in the visual axes of both eyes not being parallel, therefore, one eye will be clear and both eyes will be blurred. Strabismus can be relieved by drugs such as atropine and botulinum toxin, or by surgery to adjust the pulling force of extraocular muscles. 2. Hyperthyroidism: Hyperthyroidism leads to accumulation of mucopolysaccharides and other substances in the retro-orbital area, and the eyeball protrudes, resulting in deviation of the visual axis, so one eye will be clear and both eyes will be blurred. You can take methimazole, propylthiouracil and other medications, or iodine¹³¹ radiation therapy, surgical treatment. 3. Orbital injury: Orbital fracture leads to extraocular muscle injury, eye position deviation, eye movement limitation, etc., which will be clear in one eye and blurred in both eyes. Surgery is needed to repair the damage. 4. Scleritis: the lesion involves the extraocular muscles and leads to diplopia, which results in clear vision in one eye and blurring in both eyes. Apply tobramycin, levofloxacin, dexamethasone and other eye drops for treatment. Seeing things clearly in one eye and blurring in both eyes, should consult a doctor in time, if you need to use medicine should follow the doctor’s advice.