This is a descriptive term used by eye doctors to describe eyes that are in poor alignment with each other. For example, someone with strabismus may be cross-eyed, wall-eyed, or have an eye that drifts upwards. Some people have strabismus that occurs only when tired and others have a problems with double vision only with reading. There are many causes for strabismus, from congenital motor problems to cranial nerve palsies. Strabismus needs to be evaluated by an eye doctor for an appropriate workup. If the alignment problem persists, strabismus surgery is sometimes recommended. Prism glasses are another option, especially for long-standing strabismus in adults.