Rotatory or vertical: Nystagmus is atypical; horizontal nystagmus, not always. A pediatric ophthalmologist looks for a small optic nerve/ small fovea, rod & cone abnormalities or visual impairment. If the retina looks normal, an electroretinogram is used to test rod & cone function. If there is even a tiny concern, neurological eval & neuroimaging are done. Fyi, by 3-4 mos. A neurotypical infant can fixate on objects.
Answered 10/9/2018
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