functional blindness
visual deterioration without any apparent change or disease affecting the structural integrity of the visual system: one of the most frequent symptoms in somatization disorder. In addition to loss of acuity, visual functional phenomena may include photophobia; burning, painful, or tired eyes; monocular diplopia (double vision); ptosis; blepharospasm; convergence problems; and severe concentric visual field constriction in one or both eyes. Despite the symptoms, the pupils continue to react to light, and the patient automatically avoids (i.e., is able to detect and thereby avoid) objects that would cause injury. Complete functional blindness is rare. The condition was formerly known as hysterical blindness or psychic blindness.