Eyes that always stare in one direction and cannot turn freely are usually caused by diseases of the extraocular muscles. There are several common conditions: 1. Due to paralytic strabismus. For example, a viral infection or demyelinating lesion that causes damage to the motoneurotic nerve, abducens nerve, and talocrural nerve, or damage to the neurons in the central nervous system that are responsible for eye movements, can lead to the inability to move the eye normally, resulting in the appearance of the eye always staring in one place. 2. Due to restrictive strabismus. For example, trauma leads to orbital fractures, tumors and other occupational lesions in the orbit, which cause the extraocular muscles to adhere to the surrounding tissues and prevent normal rotation, resulting in the eyes always staring at one place. 3, caused by oculomotor myasthenia gravis, an autoimmune disease, in which the extraocular muscles are affected and cannot contract normally, making the eyes unable to move and always looking at the same place.