Many diseases cause transient
or permanent visual loss. Transient loss (amaurosis fugax) occurs most often
as a result of blood flow problem to the eye and may precede a stroke.
Inflammation of the eye nerve (optic neuritis) is associated with eye pain
and causes transient loss of vision, which if unattended may proceed to
permanent loss. Diabetes and glaucoma (increased intra eye pressure) are
other common causes of disturbed vision.
Eyes look at objects, but the
brain sees them. Many disorders of the brain cause blindness. Either the
whole of the visual field, or more typically part of it, is lost depending
on the area of the brain involved. The brain also controls the eye ball
movement which is essential for identical images in both eyes or else
double vision is the result.
Obviously every visual
disturbance, even if it is a transient one, should be evaluated.
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