| |
 |
CENTRAL VEIN OCCLUSION
This is an unfortunate condition affecting the main vessels
In the back of the eye. It usually occurs in elderly patients
and permanently reduces vision in the affected eye.
The retina is the delicate, light—sensitive layer in
the back of the eye. Only one central vein drains all the
blood from the retina. At the point where this vein leaves
the eye, it shares a common wall with the central retinal
artery. The vein may become blocked in a number of ways.
Because of its close association with the artery, the vein
may become occluded as a result of any disease affecting
the arterial wall. This is why arteriosclerosis (hardening
of the arteries) is the most common cause of central vein
occlusion.
Other systemic problems that can lead to C.V.O are diabetes,
high blood pressure, and certain rare blood disorders. Patients
are usually in good health prior to the onset of the occlusion.
Several eye problems are related to C.V.O, including glaucoma,
optic nerve abnormalities and localized arterial disease
in the retina itself.
A profound painless loss of vision usually accompanies closure
of the retinal vein. In most, this vision loss is sudden
and worsens over a few days. Only with time may the vision
improve.
There is no known treatment that is effective for this problem.
The ophthalmologist's job is to establish a cause, if one
can be found, and monitor the eye for any complications.
The two most common complications are:
- New blood vessel growth on the surface of the retina.
These new vessels, even though well—intentioned,
are always abnormal and will lead to hemorrhages inside
the eye if left untreated.
- New vessels may form on the colored part of the eye
(iris). This condition is called rubeosis and may lead
to a painful form of glaucoma and repeated hemorrhages
in the eye.
There is no medical treatment for this condition. Early detection
Is the key to treating the complications of C.V.O.. Treatment
with laser may be effective in maintaining vision and preventing
further visual loss. That is why, after a C.V.O., patients
need to be frequently examined for several months. The final
visual outcome Is dependent upon the extent of cell damage
done at the time of the original occlusion and upon the results
of any treatment done for the potential complications.
Return to Eye Diseases
|
