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Temporal                         Nasal
6
Ring scotoma
Definition: Visual field defect that encircles fixation
Visual acuity: Retained
Retinal > Optic nerve lesions
Locations
  Mid-peripheral: 30° to 60°
    Retinitis pigmentosa
    Aphakic correction
  Peri-central: 5° to 30°; Ring incorporates blind spot
    Photoreceptor dystrophies
    Paraneoplastic/Autoimmune
  Central: Within central 10°
    Acute: High caffeine intake



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Visual field loss diagrams
Neuromuscular Home Page

11/30/2010