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.
This causes light rays to focus at a point in front of the retina, rather than directly on its surface. Concave lenses are used to correct the problem. MYOPIA Hyperopia, or farsightedness, is when light entering the eye focuses behind the retina. Hyperoptic eyes are shorter than normal.