I am having a hard time recalling where I had heard this, but I do recall someone saying (perhaps in a video) that cells in the retina divide very rapidly during infancy due to ongoing development of the eye - they were saying this as a justification for the incurrence of mutations in the retinal cells of infants. I searched this up recently and can't find any source that supports this claim. I did learn that there are stem cells in the retina that remain after birth, so I was wondering if the person meant to say there are lots of undifferentiated cells in the retina of infants. I think the more holistic question that I should be asking is: why do eye conditions like retinoblastoma develop primarily in infants?
If it is because of a large number of undifferentiated cells in the retina of infants, can I also be let known when (i.e. at what stage in life) these undifferentiated cells exist in highest number and when they all (or at least mostly all) become fully differentiated?