I'm the one that posted about that problem on this forum and have had it happen to me.
This is how is was explained to me by my spinal doctor and my ophthalmologist.
The reason that this can occur is because of the position that you are put in for the spinal surgery. You are positioned on, what look like very small "horses" that are used for construction. That puts your head way down below your heart level and puts pressure and strain, into your head and the eyes.
Thes things are used to arch your spine up toward the ceiling to make it easier and safer for the doctor to do surgery.
The same type of set up is used for spinal injections.
The pressure builds up in your eyes while you are in this position. It can be a cumulative affect as well as just a one time affect during surgery that can cause the problem.
So if you've had several spinal injections over a period of several months and then spinal surgery, you have a compound build up of pressure and strain from each time you are in this position.
Though it could also happen from just one time in that position and it doesn't have to be a very long time either.
From what I understand with LSI and Bonati, you are in that position quite a few times prior to surgery as well as during surgery, so that could be a compound affect.
From what I was told, it can happen roughly 50% of the time.
Also included in the factor of this happening is age, especially if you are over 50 and I am 56, as floaters beginning to occur usually starts to happen after the age of 50.
The viscous fluid in the eye begins to thin and releases the material that is called floaters.
I had never seen one in my eyes prior to surgery, but had 3 epidurals done between end of Feb. and Beginning of May, all done under sedation and florscope and then had surgery mid June.
The strain and pressure caused that viscous fluid to speed up in it's natural process and release the floaters and I had quite a few of them and still do.
Retinas can tear and/or detach for many reasons, but the most common is the strain we can put on them from lifting heavy objects incorrectly. Stoop and bend the knees when you go to pick up something on the floor, never lifting anything over 50 pounds alone, be careful when bending over that you don't leave your head that way for a long time.
Some people are more susceptible to developing floaters than others. Someone like my husband who has terrible vision, can barely see his hand in front of his face without his glasses are more susceptible to retinal tears/detachments and floaters. He has had a retinal tear in both eyes that have been repaired.
As for preventing this from happening with spinal surgery, you can't. What is important is to be aware of the possibility, no what to watch for and if those floaters start coming in your eyes, call and go see your eye doctor right away. They will dilate your eyes immediately so they can see if there is a problem with the retinas. If you start to see flashes of light, that's an emergency ASAP call to the eye doc and seen ASAP. That indicates a detachment of the retina and if not immediately reattached you will lose the vision in your eye.
If those floaters start to occur, you will be restricted in lifting things, no more than 5 pounds to start, no bending over at all for a period of 6 weeks at least and be checked every couple of weeks and if things stay stable you will progress with how much weight you can lift, but you will always be told to avoid bending over whenever possible, which is something we shouldn't do anyways, especially with our backs.
By the way, once those floaters start, you have them for good. Some days they are worse than others but you get used to them and don't notice them. The last time I was at the eye doc was in July and when he asked me how the floaters where, I told him I didn't see them now. he smiled and after my eye exam told me that he saw lots of them, but I've gotten used to them and just don't notice them. I know don't have to go back to be seen for 6 months.
Ironically, my eye docs wife is also an eye doc, specialty is children. She had spinal surgery with my spine surgeon, 2 weeks after I did for the same thing. She's 2 years younger than me and she developed the floaters as well.
It's something to be aware of, take care of if it happens and it usually does as we age, can't prevent it. Is it enough to not have any kind of spinal surgery or epidural injections. In my opinion no way. I'm just glad I knew about the possibility before hand, so when they occurred I didn't panic, just did what I was told to do. I called the eye doc and he had me come in within 2 hours to check the eyes and been monitoring me since.
Fran