Friday 30 May 2014

Congenital nystagmus


CONGENITAL

Convergence & eye closure dampens
Oscillopsia absent
Null zone that is present, increases foveation time which results in increased acuity
Gaze poisition does not change the horizontal direction of nystagmus
Equal amplitude and frequency in each eye
Near acuity is good
Inversion of optokinetic response
Turning of head to acheive null point
Abolishes in sleep
Latent (occlusion) nystagmus occurs

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