#blind_spot__blindspot__optic_disc__opticdisc__optic_disk__opticdisk  the point where the optic nerve enters the retina; not sensitive to light
  supertype:  #point  the precise location of something; a spatially limited location; "she walked to a point where she could survey the whole street"
  part of:  #retina  the light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve
     part of:  #eye__oculu__optic__peeper  the organ of sight (`peeper' is an informal term for `eye')
        part of:  #visual_system  the sensory system for vision
        part of:  #human_face__humanface  the front of the head from the forehead to the chin and ear to ear; "he washed his face"; "I wish I had seen the look on his face when he got the news"
           part of:  #head__caput  the upper or front part of the body in animals; contains the face and brains; "he stuck his head out the window"
              part of:  #animal__animate_being__animatebeing__beast__brute__creature__fauna  a living organism characterized by voluntary movement

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