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In page Cerebroretinal microangiopathy with calcifications and cysts:

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The majority of affected children present with symptoms and signs relating to the eyes such as leukokoria, redness, irritation and impaired vision, which result from retinal detachment and glaucoma.[1][2][3] A minority present with seizures or spasticity. The time of onset of symptoms varies from infancy to adolescence. Because a child born before term will need to undergo screening for retinopathy of prematurity, some will have abnormalities in their retinal blood vessels detected when they have no symptoms yet.[citation needed]