Involuntary, rapid, oscillating movement of the eyeballs (most commonly from side to side); an instance or type of this.

Of the eyes: Irregular turning this way and that.

the forced and persistent turning of both eyes to one side while their relation to each other remains unaltered.

The relationship between the axes of vision of the eyes during binocular fixation (in the absence of an adequate fusion stimulus); spec.…

vertical movement upwards of one eye alone; the degree to which this action occurs.

the simultaneous movement of one eye upwards and the other downwards, classified as left or right according to which eye moves upward; the degree…

involuntary contraction of the ocular muscles resulting in fixation of the eyes in an extreme (typically upward-looking) position, persisting for…