Nystagmus

(nis-tag'-mus). An oscillatory movement of the eyeballs, generally horizontal, inherited, and a ociated with some other ocular abnormality, with albinism, or depending on intracranial disease, especially meningitis or multiple sclerosis. N., Lateral, oscillation of the eyes in the horizontal meridian. N., Miner's, a variety of nystagmus occurring in miners, due to the irregular action of the ocular muscles as the eyes follow the flickering light of candle or lamp, the miner lying in an unnatural position. N., Rotatory, a partial rolling of the eyeball around the visual axis. N., Vertical, oscillatory movement in the vertical meridian.