A number of conditions may cause a person to elevate the chin in order to improve visual perception.
Orbital:
(1) thyroidectomy (? thyroid eye disease)
(2) blowout fracture of orbit
(3) general fibrosis syndrome (strabismus fixus)
Esotropia or exotropia:
(1) V pattern exotropia with fusion in downward gaze
(2) A pattern esotropia with fusion in downward gaze
Palsies:
(1) superior oblique tendon sheath syndrome (Brown Syndrome)
(2) double elevator palsy
(3) inferior oblique muscle palsy
(4) superior rectus muscle palsy
(5) dorsal midbrain lesion syndrome (Parinaud Syndrome)
(6) supranuclear lesion (upgaze palsy)
Miscellaneous causes:
(1) adaptive (contact lenses, glasses)
(2) incomplete bilateral ptosis
