Signs and Symptoms
"Cross-eyed" vergence. Arrow indicates accommodation.One eye moves normally, while the other points in (esotropia or "crossed eyes"), out (exotropia), up (hypertropia) or down (hypotropia).
Strabismus is often referred to as "lazy eye", or known as amblyopia. In fact, amblyopia refers to the brain's ignoring input from one eye, which itself can result from discordance in the images provided by the eyes such as occurs in constant unilateral strabismus. It is also referred to as "crossed eyes", “wandering eyes”, or having a “cast”.
"Cross-eyed" means that when a person with strabismus looks at an object, one eye fixes on the object and the other fixes with a convergence angle less than zero; the optic axes overconverge. "Wall-eyed" means that when a person with strabismus looks at an object, one eye fixes on the object and the other fixes with a convergence angle greater than zero; that is, the optic axes diverge from parallel.
Read more about this topic: Strabismus
Famous quotes containing the words signs and, signs and/or symptoms:
“The LORD brought us out of Egypt with a mighty hand and an outstretched arm, with a terrifying display of power, and with signs and wonders; and he brought us into this place and gave us this land, a land flowing with milk and honey.”
—Bible: Hebrew, Deuteronomy 26:8.
“Murderous desire, hatred, distrust are nowadays the accompanying signs of physical illness: so thoroughly have we embodied our moral prejudices.—Perhaps cowardice and pity appear as symptoms of illness in savage ages. Perhaps even virtues might be symptoms.”
—Friedrich Nietzsche (1844–1900)
“In retirement, only money and symptoms are consequential.”
—Mason Cooley (b. 1927)