visual (redirected from visuality)

visual /vis·u·al/ (vizh´oo-al) pertaining to vision or sight.

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vi·su·al (vzh-l)

adj.

1. Of or relating to the sense of sight.

2. Seen or able to be seen by the eye; visible.

3. Optical.

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visual

[vizh′o̅o̅·əl]

Etymology: L, visus, vision

pertaining to the sense of sight.

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visual

pertaining to vision.

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visual acuity test

performed by walking the animal through an obstacle course. A room full of unfamiliar furniture, or a stairway is usually used for companion animals. Farm animals are led or driven through a passage with drums or boxes strewn across it.

visual cortex

the part of the cerebral cortex which deals with images received by the visual apparatus.

visual evoked potentials (VEPs)

see visual evoked response.

visual following

movement of the eyes in watching a moving object.

visual pathway

the bulk of the retinal ganglion cells have axons in the optic nerve which synapse with cells in the lateral geniculate nucleus in the thalamus, which project to the visual cortex in the occipital lobe of the cerebrum; in a secondary visual pathway the axons of the remainder of the retinal ganglion cells terminate in the anterior rostral colliculus (pretectal region).

visual system

includes the eye, the optic nerve and the optic cortex in the cerebrum. The oculomotor, trochlear, abducent, trigeminal and facial nerves are all involved in reflexes which are part of the animal's responses to visual stimuli.

visual yellow

all-trans retinal; see retinal (2).

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visual 

Relating to vision.

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Patient discussion about visuality.

Q. Can visual aura alone be migraine? I'm 21 years old girl, and for the last six years, about once a week, when I wake up from night sleep all I see in my left eye is a very bright light. After some time my vision returns. In the last few weeks it became more frequent and also starts to happen in the other eye. I consulted my doctor and she told me it's not an important thing, and that it's probably a specific type of migraine. However, I don't have any pain at all. Does anyone else have this? Is it possible for migraine to occur only with aura, without any pain?

A. Hi,

I'm sorry to hear about your problem. Whatever your doctor told you, you should know that if it bothers you, it IS an "important thing". I also suffer from similiar thing (only visual disturbances after I wake up, without any pain), and when my doctor prescribed me meds they went away. You should consult your doctor again and ask him for a solution for this thing.

Q. What are the visual distinctions between thermal burns and frostbite? Is it possible to definitively distinguish the two from each other in all cases, or do they present identically in many cases? In other words, are frostbite injuries-for all intents and purposes, actual burns and if they are not, in what ways do they differ?

A. Early frostbite and minor burns may resemble one another visually (by whitened, blanched looking skin, and blister formation). However, last stage frostbite and thermal (heat) burns are very different.
In late stage frostbite, the ice crystals in the cells melt and the ruptured cells pour out their contents, then blisters may form. Since the affected area has basically lost circulation, gangrene sets in rather quickly and the tissue turns black and dry.
Deep (full thickness) heat related burns are surrounded by areas of erythema (reddened skin) and skin with less degrees of burning. Also, eschar is obviously charred skin tissue forming a scab like structure, and looks nothing like gangrene. The wound bed in a burn leaks plasma constantly. Blistering is pretty immediate with heat related burns of a sufficient degree.