Article Text

other Versions

PDF
Recovery of visual-field defects after occipital lobe infarction: a perimetric study
  1. Mehmet Çelebisoy1,
  2. Neşe Çelebisoy2,
  3. Ece Bayam2,
  4. Timur Köse3
  1. 1Atatürk Research and Training Hospital, Clinic of Neurology, İzmir, Turkey
  2. 2Ege University, Medical School, Department of Neurology, İzmir, Turkey
  3. 3Ege University, Medical School, Department of Biostatistics and Medical Informatics, İzmir, Turkey
  1. Correspondence to Professor Dr Neşe Çelebisoy, Ege University Medical School, Department of Neurology, Bornova, İzmir, 35100, Turkey; nese.celebisoy{at}ege.edu.tr

Abstract

Objective To assess the temporal course of homonymous visual-field defects due to occipital lobe infarction, by using automated perimetry.

Methods 32 patients with ischaemic infarction of the occipital lobe were studied prospectively, using a Humphrey Visual Field Analyser II. The visual field of each eye was divided into central, paracentral and peripheral zones. The mean visual sensitivity of each zone was calculated and used for the statistical analysis. The results of the initial examination, performed within 2 weeks of stroke, were compared with the results of the sixth-month control. The lesions were assigned to the localisations, optic radiation, striate cortex, occipital pole and occipital convexity, by MRI.

Results A statistically significant improvement was noted, especially for the lower quadrants. Lesions of the occipital pole and convexity were not significantly associated with visual-field recovery. However, involvement of the striate cortex and extensive lesions involving all the areas studied was significantly associated with poor prognosis.

Conclusions Homonymous visual-field defects in our patients improved within 6 months. Restoration of the lower quadrants and especially the peripheral zones was noted. Incomplete damage to the striate cortex, which has a varying pattern of vascular supply, could explain this finding. Magnification factor theory, which is the increment of the receptive-field size of striate cortex cells with visual-field eccentricity, may explain the more significant improvement in the peripheral zones.

  • Homonymous visual-field defects
  • occipital lobe
  • automated perimetry
  • cerebrovascular disease
  • ophthalmology

Statistics from Altmetric.com

Footnotes

  • Competing interests None.

  • Patient consent Obtained.

  • Ethics approval Ethics approval was provided by The Ethics Committee of Ege University Medical School.

  • Provenance and peer review Not commissioned; externally peer reviewed.

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.