Also known as crossed-eyes, walleye or squint, the American Optometric Association defines strabismus as “a condition in which both eyes do not look at the same place at the same time.”
The condition—which is present in approximately 4 percent of the American population—may be a persistent issue or occur intermittently. Strabismus may not always affect the same eye, either. In some cases, AllAboutVision.com says “the two eyes may take turns being misaligned.” Let’s take a closer look at the causes, symptoms, and different types of strabismus with the following six facts.
According to Doctors of Optometry Canada, strabismus most commonly affects children under the age of six. In most cases, however, it typically appears between birth and 21 months of age. Unfortunately, children rarely outgrow strabismus, and without proper treatment it can cause permanent vision problems, such as an amblyopic (lazy) eye.
Although rare, the source says it’s possible for the condition to develop later in a person’s life, often as a result of a stroke, tumor, or muscle or nerve disease.