Strabismus - Signs and Symptoms

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:

    But I will harden Pharaoh’s heart, and I will multiply my signs and wonders in the land of Egypt.
    Bible: Hebrew, Exodus 7:3.

    A strong nation, like a strong person, can afford to be gentle, firm, thoughtful, and restrained. It can afford to extend a helping hand to others. It’s a weak nation, like a weak person, that must behave with bluster and boasting and rashness and other signs of insecurity.
    Jimmy Carter (James Earl Carter, Jr.)

    Protest, evasion, merry distrust, and a delight in mockery are symptoms of health: everything unconditional belongs in pathology.
    Friedrich Nietzsche (1844–1900)