In adults, the sudden appearance of strabismus results more commonly from the paresis of the oculomotor muscles ( paralytic strabismus ), a possible consequence of cranial trauma, vasculopathies, infectious diseases, diabetes and degenerative diseases of the central nervous system. In the presence of this condition, the ability to move the two eyes in the same way and at the same time is lost. The main symptom with which paralytic strabismus is manifested is diplopia (double vision), often accompanied by vertigo, difficulty in orientation and tendency to tilt the head in the opposite direction to the deviation.
In adulthood, moreover, a latent strabismus can appear, which means that it persists from childhood and manifests itself only under certain conditions. Unlike paralytic strabismus, diplopia is not present, but effort-related symptoms can be associated with maintaining the fusion of visual images, including headaches, visual fatigue, burning, photophobia and frowning.
