#retina  the light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve
  supertype:  #tissue_layer__membrane  a pliable sheet of tissue that covers or lines or connects organs or cells of animals
  part of:  #eye
  part:  #neuroepithelium  epithelium associated with special sense organs and containing sensory nerve endings
  part:  #fovea_centralis__foveacentrali__fovea  area consisting of a small depression in the retina containing cones and where vision is most acute
  part:  #parafovea  area of the retina immediately surrounding the fovea
  part:  #macula_lutea__macula__macular_area__maculararea__yellow_spot  a yellowish central area of the retina that is rich in cones
  part:  #visual_cell  one of the cells of the retina that is sensitive to light
  part:  #blind_spot__blindspot__optic_disc__opticdisc__optic_disk__opticdisk  the point where the optic nerve enters the retina; not sensitive to light
  part:  #retinal_cone__retinalcone__cone__cone_cell  visual receptor cell sensitive to color
     part:  #iodopsin  a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision
  part:  #retinal_rod__retinalrod__rod__rodcell  visual receptor cell sensitive to dim light
     part:  #visual_purple__rhodopsin__retinal_purple__retinalpurple  a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light

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