The general type of nystagmus present in a patient can identified based on the clinical findings. Further characterization of the nystagmus can then be performed.
General types of nystagmus:
(6) manifest latent
Nystagmus present when eyes are in primary position with fixation
nystagmus does not show conjugate movements
nystagmus shows conjugate movements;
long history of nystagmus with high frequency and no oscillopsia
not a long history of nystagmus;
nystagmus increased by occlusion of one eye
manifest latent nystagmus
nystagmus not increased by occlusion of one eye
Nystagmus absent when eyes are in primary position with fixation
nystagmus present when fixation blocked
nystagmus not present with fixation blocked;
nystagmus shows increased intensity or change in direction when in eccentric gaze;
nystagmus not changed in eccentric gaze;
nystagmus present with occlusion of one eye
nystagmus not present with occlusion of one eye;
nystagmus shows conjugate movement
nystagmus does not show conjugate movement
• Conjugate movements indicate that the oscillations and changes are symmetric in both eyes.
• Oscillopsia = oscillating vision, with objects seeming to move back and forth, to jerk or to wiggle (Dorland's Illustrated Medical Dictionary)
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