I sometimes see flashes of light floating in front of me. Are my eyes going bad?

Your symptoms can be. one or two separate issues. Flashes of light seen in a dark room may be due to vitreous pulling the retina causing retinal traction, tears, breaks or even detachments and should be evaluated. Lights seen in a zig-zag fashion may be from visual aura known as a 'scintillating scotoma" and is associated with a variation of migraine headaches. This as well can be evaluated.