Crossed eyes, or strabismus, is an eye condition where both eyes aren’t looking in the same direction at the same time. Typically, strabismus occurs in people who are very farsighted or have weak eye muscle control. Strabismus is also referred to as squint or squint eye.
Your eye movement is controlled by six muscles that receive signals from your brain, telling your eye to look up, down, left and right. Your eyes typically work together so they point in the same direction at the same time. Problems arise when one or more of the six muscles aren’t functioning properly or aren’t receiving the signals to tell the eye where to turn. The irregular eye turning of strabismus may occur all the time or only when you are ill, tired or have done a lot of reading or focused work. The same eye may irregularly turn consistently, or your eyes may alternate in abnormal turning.
Strabismus, or crossed eyes, is caused by issues with the eye muscles, the nerves that connect them to the brain or the control center of your brain that sends signals to those muscles to guide your eyes. Strabismus also can be caused by eye injuries and other health conditions in the body.