Nystagmus is an involuntary, rhythmic, oscillatory eye movement that can be horizontal, vertical, torsional, or mixed. It is classified into congenital (infantile) nystagmus (present from birth or early infancy) and acquired nystagmus (developing later due to neurological, vestibular, or ocular causes). Common underlying conditions include albinism, congenital cataracts, optic nerve hypoplasia,...
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