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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