I've had six epidurals and as Scampi said, simply steroids injected thru the epidural space and I will never have one again. Steroids decalcify bone and in my case I had a CT which showed tremendous lack of calcium in that very space and in no where else in my bone structure. CLKD the results last from none to indefinite and depend on the cause of inflammation. For example a fall with inflammation might be reduced permanently, whereas degenerative disc disease will recur immediately, after a week or possibly two weeks. I think it is a very stupid procedure, not without risk. I am very lucky to have a cold laser which stimulates healing with no side effects and because there is not a high profit motive drug companies will try to avoid people learning of the laser. Although Getting more and more recognized in US for traumatic brain injury, stroke, shingles, muscle, tendon, ligament, back and neck. Drug companies rule....
I think visual disturbances somehow tie in with neck and stress and hormones. I've had them since I was fifty.