#ametropia  (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia
  supertype:  visual_impairment__visual_defect__vision_defect__visual_disorder  impairment of the sense of sight
  subtype:  myopia__nearsightedness__nearsightednes__shortsightednes  (ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred
  subtype:  astigmia__astigmatism  (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea
     subtype:  keratectasia  abnormal bulging of the cornea of the eye
     subtype:  keratoconus__keratoconu  abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia
  subtype:  hyperopia__hypermetropia__hypermetropy__farsightedness__longsightedness__longsightednes  abnormal condition in which vision for distant objects is better than for near objects
     subtype:  presbyopia  farsightedness resulting from a reduced ability to focus caused by loss of elasticity of the crystalline lens with age

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