A white wall is never just a white wall - I get this granulated or dotted or pixel effect - but doesn't everyone experience this?? And yet, I can focus and see fine detail quite well, so I really don't know if what I am seeing is 'snow' or not. I also see halos and effects round street lamps - again, I just took this to be the effect of atmospheric humidity and part of normal experience. I get a flickering after I turn off a light, and often get afterimages, but doesn't everyone?? I also have hyperacusis.