About one year ago, i use to get these very abnomal problems with my vision where, out of no where my peripheral vision would completely blacken and only what was directly in front of me would be visible and even that would seem to become very distant even though whatever what was in front of me would be relatively close. On other occassions, when i use to take my dog out for walks at night time we would be walking down the street and i would look at houses and all of the sudden my vision would seem to... lag? That's the best way i can describe it, like in a computer game when the graphics become choppy, that's what would happen to my vision... I would become very disoriented and my vision choppy until i looked away. I haven't had the first problem with my vision for quite some time now, but i would still like to know what both are.