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.
When youâre a child, if one eye doesnât see well, your brain may favor the other. This condition, called ambylopia, can happen if your eyes arenât aligned right (strabismus or crossed eyes) or one eye just doesnât work as well.