Lee ebe a n'okpuru ma zaa ajụjụ a na-eso ya n'otu asụsụ ahụ dị ka ebe a: Ebe a: Akwara anya na-agụnye axons nke retinal ganglion cell na glial cells. Akwara anya nke mmadụ ọ bụla nwere ihe dị n'agbata 770,000 na 1.7 nde akwara akwara, nke bụ axons nke retinal ganglion cells nke otu retina. Na fovea, nke nwere oke nkọ, mkpụrụ ndụ ndị a na-ejikọta ihe dị ka mkpụrụ ndụ 5 photoreceptor; n'akụkụ ndị ọzọ nke retina, ha na-ejikọta ọtụtụ puku photoreceptors. Ajụjụ: Olee otú ọtụtụ akwara akwara anya mmadụ nwere
770,000 na nde 1.7