My ophthalmologist keeps a close watch on my eyes. I had an increase in floaters and flashes after about 3 months of being on Tamoxifen. Really difficult to tell if it caused them or not. In my case the concern would be retinal detachment, I already had a very mild issue with it. An increase in cataracts is another issue - but with my family history I’m already planning that cataract surgery is in my future anyway. It’s not a matter of if, just when.

I did not have blurred vision. But that is a specific issue my ophthalmologist seems concerned with. After the initial problem with floaters and flashers my vision has settled down and I’m back to the level prior to starting tamoxifen. I did start on 20 mg and switched to 5 mg after six months and am now self-prescribed 2.5-3.5 mg due to memory, brain fog. It’s very difficult to set an exact cut on the 10 mg pill when cutting in half or thirds.