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What is Gun barrel vision is seen in and explain in detail?
(B) Papillaedema# GUN BARREL VISION that appears as when looking through a Tunnel or Gun Barrel.> Common Causes:1. Glaucoma (Late)- Chronic open angle glaucoma2. Retinitis pigmentosa3. Post-papillaedema optic atrophy4. Hyaline bodies Drusen) of optic disc5. Bilateral occipital infarcts with macular sparing6. Malingering or Hysteria7. Blood loss8. Hallucinogens9. Extreme fear10. Pituitary stalk tumour11. Severe cataract12. Migraine aura13. Altitude sickness14. Hypoxia> Less common Causes:1. Panic attack2. Exposure to hydraulic fluids3. Intense anger