Identifier |
wh_ch4_p200 |
Title |
Walsh & Hoyt: Differentiation by Visual Field |
Creator |
Alfredo A. Sadun, MD, PhD; Madhu R. Agarwal, MD |
Affiliation |
(AAS) Flora L. Thornton Chair, Professor of Ophthalmology and Neurological Surgery, Keck School of Medicine at USC; (MRA) Hoag Hospital |
Subject |
Optic Nerve Diseases; Eye Abnormalities; Visual Impairments; Optic Atrophy; Visual Field, Differentiation |
Description |
When the photoreceptors are affected, the defect in the visual field corresponds to the retinal defect in position, shape, extent, and intensity. When the ganglion cell or nerve fiber layer is damaged, however, the field defect does not conform to the size and shape of the lesion but rather to the field represented by the ganglion cells whose fibers are damaged. Thus, a small lesion situated close to the optic disc that damages only photoreceptors usually causes a small scotoma, whereas a lesion of the same size that damages the ganglion cells and nerve fibers in the same area may result in an extensive defect in the visual field. Conversely, a small lesion in the periphery that damages only a few fibers transmitting impulses from widely separated ganglion cells may produce such a small field defect that it may be difficult or even impossible to detect. |
Date |
2005 |
Language |
eng |
Format |
application/pdf |
Type |
Text |
Source |
Walsh and Hoyt's Clinical Neuro-Ophthalmology, 6th Edition |
Relation is Part of |
Walsh and Hoyt's Clinical Neuro-Ophthalmology Walsh and Hoyt's Clinical Neuro-Ophthalmology |
Collection |
Neuro-ophthalmology Virtual Education Library: NOVEL http://NOVEL.utah.edu |
Publisher |
Wolters Kluwer Health, Philadelphia |
Holding Institution |
Spencer S. Eccles Health Sciences Library, University of Utah, 10 N 1900 E SLC, UT 84112-5890 |
Rights Management |
Copyright 2005. For further information regarding the rights to this collection, please visit: https://NOVEL.utah.edu/about/copyright |
ARK |
ark:/87278/s6nk6pg3 |
Setname |
ehsl_novel_whts |
ID |
185669 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6nk6pg3 |