Strabismus is a visual defect in which the eyes are misaligned and point in different directions.  One eye may look straight ahead awhile the other eye may look inward, outward, upward or downward.  The eye turn may be constant or may come and go.   The cause of strabismus may be eye disease, or a need for glasses or an underlying misalignment that requires surgery.   A prompt examination is important to establish the cause.