Normally, postnatal development of the human retina involves
centrifugal displacement of the inner retinal layers (IRLs) from the
fovea, centripetal migration of the cone photoreceptors into the
fovea, and elongation of the photoreceptors with age.
It is not clear whether retinal development in infants and young children
with achromatopsia (ACHM) occurs in a similar way and whether
any retinal changes that occur are progressive in early childhood. [opening paragraph