“If you cross your eyes, they might get stuck that way.”

The idea that your eyes can get stuck if you cross them is a common misconception, often used as a playful warning to children. This myth likely originated from parents or caregivers trying to discourage children from making silly faces, perhaps noticing the temporary strain or odd appearance that can result from sustained eye crossing. The discomfort or muscle fatigue experienced when holding this position might have inadvertently fueled the belief that the eyes could become permanently fixed.

Scientifically, our eyes are equipped with six extraocular muscles that are specifically designed for a wide range of movements, including the ability to cross them. This voluntary action, known as convergence, is a normal function that helps us focus on nearby objects. When you stop intentionally crossing your eyes, these muscles simply relax, allowing your eyes to return to their natural, aligned position. There is no evidence to suggest that these muscles can somehow "lock up" or cause permanent misalignment through voluntary action.

People commonly believe this myth due to a misunderstanding of how eye muscles work and sometimes confuse voluntary eye crossing with actual medical conditions. Conditions like strabismus, where the eyes are genuinely misaligned and do not work together, can appear similar to crossed eyes. However, strabismus is an involuntary condition caused by issues with eye muscle control or nerve signals, not by someone choosing to cross their eyes. Furthermore, some infants may appear to have crossed eyes, a condition called pseudostrabismus, due to facial features that create an optical illusion, which typically resolves as they grow. This visual phenomenon might also contribute to the persistence of the myth.