The eye movement disorder in patients with thyroid associated ophthalmopathy (TAO) is not common, that is, the angle of strabismus is differ
The eye movement disorder in patients with thyroid associated ophthalmopathy (TAO) is not common, that is, the angle of strabismus is different in different directions. Non common strabismus can be divided into paralysis or restrictive: restrictive strabismus is due to the rotation of the mechanical obstacles caused by the eye, and paralytic strabismus is due to extraocular muscle contraction caused by lack of paralysis. Usually, features of TAO patients with extraocular muscle involvement is myositis followed fibrosis, resulting in muscle rigidity, no stretch, to the involved muscles in the opposite direction of rotation effect is limited, this is because the involved muscles cannot elongate, and when the restricted muscle antagonistic muscle contraction, the eye is pulled into orbit, temporarily increased intraocular pressure. In some cases, the muscles of the fibrosis will shorten the rotation of the eye to the direction of action, and cause the first eye to deflect. The distinction between paralytic strabismus and restrictive strabismus is the basis for the treatment of paralytic strabismus need to strengthen the role of the involved muscles, and restrictive strabismus is to weaken the role of the involved muscles.