Visual Field Deficit
Scotoma; Visual field loss
Short Description or Definition
A visual field deficit refers to diminished or absent vision in circumscribed parts of the visual field.
Visual field deficits are caused by lesions at different levels of the visual system. Lesions at the retinal level result in scotoma of the affected eye. Optic nerve lesions peripheral to the partial crossing of fibers at the optic chiasm usually cause visual field deficits for one eye only (i.e., unilateral or monocular, incongruent defect). Lesions of the chiasm, optic tract, lateral geniculate nucleus, optic radiations, and primary visual cortex produce deficits in the contralateral visual hemifield that are roughly congruent for both eyes (i.e., covering the same area when tested monocularly (Fahle 2003)).
References and Readings
- Gilman, S., & Newman, S. W. (2003). Essentials of clinical neuroanatomy and neurophysiology (10th ed.). Philadelphia: F.A. Davis.Google Scholar
- Pollock, A., Hazelton, C., Henderson, C. A., Angilley, J., Dhillon, B., Langhorne, P., Livingstone, K., Munro, F. A., Orr, H., Rowe, F. J., & Shahani, U. (2011). Interventions for visual field defects in patients with stroke. Cochrane Database of Systematic Reviews, 2011(10), CD008388. https://doi.org/10.1002/14651858.CD008388.pub2.CrossRefGoogle Scholar
- Wurtz, R. H., & Kandel, E. R. (2000). Central visual pathways. In E. R. Kandel, J. H. Schwartz, & T. M. Jessell (Eds.), Principles of neural science (4th ed., pp. 523–547). New York: McGraw-Hill.Google Scholar
- Zihl, J. (2000). Rehabilitation of visual disorders after brain injury. East Sussex: Psychology Press.Google Scholar