Ok, I work on the 4th floor of the law office where I'm employed. I do a lot of running down to other floors and as long as I'm not taking a cart with me, I generally take the stairs. Now starting yesterday I started to notice something. As of yesterday and so far twice today....When I come up the stairs I start feeling like I"m totally losing my depth perception. I have trouble figuring out how many steps are left, and how highup/far down the next step up is from my foot. No one has been in the stairwells with me, but even without anyone there I feel like an idiot and try to continue as normal. Does anyone know if this is something that will pass? I also get slight cases of vertigo up here on the forth floor from time to time...and also when I'm in taller buildings... Thanks for any help *Note, I also broke my glasses(I'm nearsited) about two weeks ago or so...I used to wear them constantly. Now I only lay them on my face when driving at night..