This iritis is all new to me. I know I'm needing support. I thought I'd offer some to you.
I work in the same working environment, in a cube, at a computer all day. I'm wondering if I wear a visor to block the light over my head would help. I've always used one outside to cut the light coming from the sky. I use my car visor the same way.
My counter in my cube is light colored too. I put folders or books on the counter on one side to help cut the glare. It's funny the things you notice! Walking outside on a bright, sunny day on white concrete has always bothered me. I have to walk in the grass or on the pavement. I've always preferred low light. I hate it when someone turns on a lamp because they think I need it. I'm always saying, "TURN IT OFF!" Ha ha.
Best of luck,