Yes I had something like that on Tamoxifen. Mine was a vein blockage behind the eye which over time has resolved itself. I take half of a 100mg aspirin daily just to dilute the blood vessels a little. Ask your doctor if that may help for you.
Even while on the aspirin, last year again (always right before xmas) I had a weird fuzzy thing in front of my eye which has turned out to be a burst blood vessel behind the eye. Odd thing is I have no blood pressure in the high range and no diabetes so the doctors are confused as to why it happened. Over time this too is resolving itself and my actual vision is fine, just with floaters now.