Hyperthyroidism may cause certain damages to the eyes, mainly including extraocular muscle involvement, thickening of soft tissues in the orbit, conjunctival and corneal lesions. 1. Involvement of extraocular muscles: the immune reaction itself will trigger the thickening of extraocular muscles, which will affect the eye movement and lead to diplopia. 2. Intraorbital soft tissue thickening: Because of immune-mediated inflammatory infiltration, it leads to intraorbital soft tissue thickening, causing the eyeball to protrude outward. 3. Keratoconus: Keratoconus is a severe eyeball protrusion leading to incomplete eyelid closure, which can occur as a result of exposure keratitis and, in severe cases, can lead to the development of corneal ulcers. The emergence of hyperthyroidism requires timely medical attention and standardized treatment under the guidance of clinicians to prevent irreversible damage.