visual-field defect

visual-field defect
Blind spot (scotoma) or area in the normal field of vision.

It may be persistent or temporary and shifting, as in a migraine aura. The field may narrow, as in glaucoma. The normally small blind spot corresponding to the point where the optic nerve enters the eye can enlarge if fluid accumulates at that point (papilledema). Methanol or quinine poisoning, diseases of the nerve sheaths, deficiency diseases, and atherosclerosis can also cause blind spots. Tumours pressing on the optic nerves in different locations can cause loss of different halves or quarters of the visual field of each eye. See also macular degeneration.

* * *


Universalium. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • visual field defect —       a blind spot (scotoma) or blind area within the normal field of one or both eyes (eye, human). In most cases the blind spots or areas are persistent, but in some instances they may be temporary and shifting, as in the scotomata of migraine… …   Universalium

  • Visual field — The term visual field is sometimes used as a synonym to field of view, though they do not designate the same thing. The visual field is the spatial array of visual sensations available to observation in introspectionist psychological experiments …   Wikipedia

  • Visual impairment — Classification and external resources ICD 10 H54 ICD …   Wikipedia

  • defect — defectible, adj. defectibility, n. defectless, adj. n. /dee fekt, di fekt /; v. /di fekt /, n. 1. a shortcoming, fault, or imperfection: a defect in an argument; a defect in a machine. 2. lack or want, esp. of something essential to perfection or …   Universalium

  • visual — /vizh ooh euhl/, adj. 1. of or pertaining to seeing or sight: a visual image. 2. used in seeing: the visual sense. 3. optical. 4. perceptible by the sense of sight; visible: a visual beauty. 5. perceptible by the mind; of the nature of a mental… …   Universalium

  • field — /feeld/, n. 1. an expanse of open or cleared ground, esp. a piece of land suitable or used for pasture or tillage. 2. Sports. a. a piece of ground devoted to sports or contests; playing field. b. (in betting) all the contestants or numbers that… …   Universalium

  • Field — /feeld/, n. 1. Cyrus West, 1819 92, U.S. financier: projector of the first Atlantic cable. 2. David Dudley, Jr., 1805 94, U.S. jurist (brother of Cyrus West and Stephen Johnson Field). 3. Erastus Salisbury, 1805 1900, U.S. painter. 4. Eugene,… …   Universalium

  • Disability — Disabled redirects here. For the poem by Wilfred Owen, see Disabled (poem). Disabilities redirects here. For the Middle Age restrictions, see Disabilities (Jewish). Disability …   Wikipedia

  • syndrome — The aggregate of symptoms and signs associated with any morbid process, and constituting together the picture of the disease. SEE ALSO: disease. [G. s., a running together, tumultuous concourse; (in med.) a concurrence of symptoms, fr. syn,… …   Medical dictionary

  • Optic neuropathy — Classification and external resources ICD 10 H46 The optic nerve contains axons of nerve cells that emerge from the retina, leave the eye at the optic disc, and go to the visual cortex where input from the eye is processed into vision. There are… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”