#eye_disease__eyedisease  any disease of the eye
  supertype:  #disease  an impairment of health or a condition of abnormal functioning
  subtype:  #glaucoma  increased pressure in the eyeball due to obstruction of the outflow of aqueous humor; damages the optic disc and impairs vision (sometimes progressing to blindness)
     subtype:  #acute_glaucoma__acuteglaucoma__angle-closure_glaucoma__angleclosureglaucoma  glaucoma in which the iris blocks the outflow of aqueous humor
     subtype:  #chronic_glaucoma__chronicglaucoma__open-angle_glaucoma  glaucoma caused by blockage of the canal of Schlemm; produces gradual loss of peripheral vision
  subtype:  #keratonosus__keratonosu  any disease of the cornea
  subtype:  #trachoma  a chronic contagious viral disease marked by inflammation of the conjunctiva and cornea of the eye and the formation of scar tissue
  subtype:  #leukoma  eye disease consisting of an opaque white spot on the cornea
  subtype:  #cataract  clouding of the natural lens of the eye

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