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Letter to the Editor
Optic nerve compression by the internal carotid artery in patients with normal tension and high tension glaucoma
  1. JUNICHI UMIHIRA
  1. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  2. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  3. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  4. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  5. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  1. KAZUHIRO OGUCHI
  1. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  2. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  3. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  4. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  5. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  1. YASUO KURIMOTO,
  2. KAORI MATSUNO
  1. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  2. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  3. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  4. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  5. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  1. KAZUAKI FUKASAKU
  1. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  2. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  3. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  4. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  5. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  1. NAGAHISA YOSHIMURA
  1. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  2. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  3. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  4. Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan
  5. Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
  1. Dr Nagahisa Yoshimura, Department of Ophthalmology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan

https://doi.org/10.1136/bjo.83.11.1306b

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    Editor,—It is generally accepted that ectatic or even normal intracranial blood vessels can cause dysfunction of cranial nerves when situated in an aberrant location.1-3Although the occurrence of such compression damage to the optic nerve is poorly recognised, several studies have shown the optic nerves can in fact be damaged by vascular compression.4-8 Recently, optic nerve compression by normal internal carotid arteries (ICA) has been suggested as a possible cause of visual field defects in patients with optic neuropathy4-6 and normal tension glaucoma (NTG).7 8 Various mechanisms have been proposed to explain the aetiology of NTG; however, the exact cause of NTG remains to be elucidated.9

    The present study was designed to determine whether optic nerve compression by the ICA can play a role in the visual field defects in patients with NTG.

    Sixteen Japanese patients with NTG (average 65.3 …

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