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Rarer causes of poor response include the presence of congenital anomalies such as choanal atresia, diaphragmatic hernia or pulmonary hypoplasia.
I also have macula hypoplasia (underdeveloped retina) which causes my low vision.
Important local growth disturbances including mandibular hypoplasia, and limb and digit length discrepancies may occur.
Some people may know the visual side alone as optic nerve hypoplasia.