advertisement
Abstract #48507 Published in IGR 14-1
Lack of spatial remapping of the visual field surrounding a monocular scotoma
Westheimer GClinical and Experimental Optometry 2012; 95: 109-112
BACKGROUND: Changes in cortical receptive fields following deafferentation raise the question of whether interruption of optic nerve fibres engenders spatial distortion in the region bordering the resulting scotoma. METHODS: The regularity and uniformity of the spatial metric surrounding a monocular Bjerrum scotoma were studied in both the affected and unaffected eyes of a glaucoma patient, using rigorous psychometric measurements and Amsler grid observations. RESULTS: No expansion of distances towards the edge of the scotoma was found; however, such a change occurs at the border of the normal blind spot, though not binocularly and not in the corresponding field of the other eye. CONCLUSION: The findings argue against cortical reorganisation following monocular retinal deafferentation in the adult.
Division of Neurobiology, University of California, Berkeley, CA 94720, USA. gwestheimer@berkeley.edu
Full articleClassification:
2.16 Chiasma and retrochiasmal central nervous system (Part of: 2 Anatomical structures in glaucoma)
6.6.1 Conventional manual (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)
