Eye sunkenness is usually caused by the following reasons: First, eye atrophy, usually seen in patients with old retinal detachment or chorioretinitis. Long-term low intraocular pressure and lack of effective support of eye contents in the eye, gradually atrophying and becoming smaller, can cause eye sunkenness. The first choice is to treat the original disease, so that the eye pressure can be restored to normal and stop the sunken eyes. For patients who have been completely blind, a prosthetic eye can be installed to improve the appearance. Second, orbital fatty tissue atrophy, related to ageing and aging factors, under normal circumstances, the orbit is filled with a large amount of fatty tissue to play the role of cushioning the eye vibration, when the orbital fatty tissue atrophy, it will lead to increasingly sunken eyes. Third, Horner syndrome, which is due to trauma, tumor, bleeding, inflammation and other stimulation of sympathetic nerve, triggering sympathetic nerve paralysis in the neck.