The maturation of toad visual units.
D000200:Action Potentials; D000818:Animals; D008675:Metamorphosis, Biological; D008839:Microelectrodes; D009899:Optic Lobe, Nonmammalian / Q000196:embryology*; D010775:Photic Stimulation; D014794:Visual Fields; D014981:Xenopus / Q000196:embryology*