16 Feb Vitreous Causes Most Retinal Disease
The vitreous causes most diseases of the retina.
Retinal tears, retinal detachments, macular holes, epiretinal membranes, macular edema, vitreomacular traction, diabetic retinopathy, diabetic macular edema and diabetic retinal detachments are all related to the vitreous.
We suspect even wet macular degeneration may play a role as well, but there is no conclusive evidence.
Even floaters, though not necessarily a disease, can be caused by abnormal optical properties of the vitreous.
Retinal Tears and Retinal Detachments
The vitreous is physically attached to the retina. If you divide the eyeball into a front half and back half while looking straight at the eye, the vitreous and retina are most adherent in the front half.
A PVD, or posterior vitreous detachment, means that the watery gel has separated from the retina in the back half of the eye, or, the “posterior vitreous.”
The anterior half remains adherent to the retina.
Hence, if enough force is generated through the vitreous and pulls on the retina, a retinal tear develops and is almost always in the front of the eye.
Retinal tears can cause retinal detachments. This is why I often recommend a vitrectomy in patients with multiple tears. By removing the vitreous, I am removing the causative agent.
Epiretinal Membranes and Macular Holes
In most cases of epiretinal membranes, a PVD has occurred. In most cases of macular holes, a posterior vitreous detachment has not occurred.
Swelling of the macula from various causes, but including diabetic retinopathy, usually occurs before a PVD occurs, that is, the vitreous is still adherent to the macular region.
What Does this Mean?
In many cases, a posterior vitreous detachment can be dangerous, as in the case of a retinal detachment or retinal tear.
In many more cases, a PVD might be “therapeutic.”
There is no conclusive proof, but separation of the vitreous interface can sometimes prevent macular edema, is probably going to be shown to reduce diabetic macular edema, may prevent retinal detachment from proliferative disease and may prevent two other conditions called vitreomacular traction (VMT) and macular holes.
Presently, a posterior vitreous detachment is a purely natural event, that is, it happens to everyone. Surgically, a posterior vitreous detachment can be induced, or caused, at the time of vitrectomy surgery. This can be a risky part of the procedure as inadvertent retinal tears may develop.
In theory, however, many of the aforementioned conditions might be avoided altogether or at least improved…leading to better vision or preventing further loss.
On the horizon, an enzyme, given as an injection that might chemically cause a PVD.
Michael N. MartinoPosted at 22:40h, 18 February
Dear Dr. Wong,
I am trying to send you photos, drawings, and specifications of the face brace that I made for my wife, Mary Butler, to help her recover from retinal detachment surgery. Please provide your email.
Randall V. Wong, M.D.Posted at 12:26h, 22 February
Thank you very much.
LizPosted at 06:43h, 22 February
Hi there! My 16 yr old son was born with a congenital cataract in his right eye. His left eye, however, had excellent vision. We made the agonising decision not to remove the cataract as we did not wish to run the risk of any other complications this would bring. Rather we patched his ‘good’ eye and tried to encourage some sight with a contact lens inserted daily until he was 7. Unfortunately his vision in this eye has never really improved beyond light and dark shade but he has managed to lead a normal life with his vision in the other eye. Recently he has become short sighted however and on routine check up, an ultrasound revealed a probable RD. One retinal surgeon has stated he is keen to attempt to rectify this ASAP in order to save the eye not his vision, another of his colleagues disagrees and says we run more of a risk interfering with the eye and the risk outweighs the benefits in this case. He says that it is not definite that he may even lose the eye. This puts us in a dreadful position as you can imagine. I would be interested in your thought. Thank you
Randall V. Wong, M.D.Posted at 12:44h, 22 February
I am assuming that the bad, right eye, now has the retinal detachment?
My understanding is that the right eye has low visual potential. Regardless, I think I’d vote for fixing the retinal detachment to save the eye. I also agree it won’t improve the vision.
John ShybeckPosted at 14:23h, 22 February
I have floaters in my eye that are semi-transparent. They are super abundant in my left eye and I want to get rid of them because they are just a pain. I have had them for about 4 years now and they have just gotten worse. Is there any chance that they will go away on there own?
Randall V. Wong, M.D.Posted at 09:15h, 23 February
If they have been there for 4 years, most likely they are staying.
Pingback:New Drug Induces PVDPosted at 10:20h, 23 February
[…] excitement in the retinal field stems from the fact that so many retinal diseases are caused by the vitreous. Many macular disorders are probably caused by interaction between the macula (retina) and the […]
milosPosted at 19:57h, 05 April
I have fresh retinal bleeding after cataract extraction.- previously dry mac degen now defect at 9.
I like your mental speed-attitude – however you frawn on PDT treatment.
Would it not (logically) be bertter for acute cases? – or why not ?
Thanks for your hint. Depressed Milos .
Randall V. Wong, M.D.Posted at 17:49h, 08 April
Dear Depressed Milos,
Don’t be depressed. Depending upon the location of the bleed (actually the location of the blood vessels causing the bleed), Avastin is probably the preferred method. PDT might be useful, too. Not really comparing the two.
Pingback:What is the Vitreous?Posted at 09:38h, 03 October
[…] The vitreous is the gel-like substance which fills most of the inside of your eye. The vitreous is composed mainly of water and is very similar to a jelly-fish; i.e., a substance which is mainly water, but still has substance. […]