Eye sunkenness is a state in which the eyeballs sink into the orbits. Depending on the etiology, it can be divided into the following conditions: First, bilateral eye sunkenness, usually associated with wasting or dehydration, often accompanied by systemic wasting disease or severe dehydration. Second, orbital trauma, such as orbital burst fracture, causes the eye and orbital tissues to sink downward into the maxillary sinus cavity, and the eye will become obviously sunken and displaced downward, sometimes accompanied by symptoms of diplopia. Third, long-term compression of orbital fat by intraorbital tumors leads to atrophy of orbital fat, and when intraorbital surgery or benign intraorbital tumors are removed, sunken eyes will occur. Fourth, chronic inflammation or hemorrhage in the orbit can lead to atrophy of the orbital tissues, resulting in sunken eyes and movement disorders. Fifth, sunken eyeballs caused by sympathetic nerve damage in the neck can be accompanied by pupil narrowing and lid fissure narrowing, and when this occurs, it is recommended to go to the hospital for examination and treatment according to the specific cause.