Floaters are exceptionally common - I've had them all my life and I'm certain that floaters in themsleves will have no effect on your medical.
I have recently been diagnosed with PVD - Posterior Vitreous Detachment. I thought it meant my bottom had fallen off but, no, it's an eye problem. It's where the fluid in one's eye becomes detached from the wall of the eye with increasing age. In itself it is harmless and there is no treatment for it unless it causes retinal problems. Symptoms include more floaters and the odd flashes of light which should subside with time. Just to satisfy my own curiosity, would any wise person on here know if PVD would be a bar to a Class 1 medical?