Chicken and egg.
Sloper
J
J
D016117:Albinism, Ocular / Q000503:physiopathology; D005584:Fovea Centralis / Q000002:abnormalities*; D006801:Humans; D009897:Optic Chiasm / Q000002:abnormalities / Q000196:embryology / Q000502:physiology; D014795:Visual Pathways / Q000196:embryology* / Q000502:physiology