|
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.
|
