noun. 1  a. An old French dance resembling the gavotte, usually in 3/4 or 2/2 time beginning with an upbeat. 2  A movement in ballet in which the dancer transfers body weight quickly from foot to foot, usually on the balls of the feet, in a series of small steps.
Nystagmus is a condition where the eyes make repetitive movements. The eyes can jerk exclusively in one direction, or make back and forth movements. With nystagmus, the eye can look jittery and can affect both eyes or just one eye.
Strabismus: Eyes don't move together in a coordinated pattern or may be crossed inward or outward. Young children with vision problems such as this may rub one or both eyes frequently and may squint, tilt their heads, or close one eye in order to see things better.