Hi Clutz..
I'm not a doctor by any stretch of the imagination but I've always been sensitive to bright lights (such as a camera flash), especially in the peripheral area. Any exposure, even for a second in my peripheral area and I can be partially blinded for hours and experience extreme headaches.
In the direct forward area, it takes a while for it to take effect. In the game I avoid going toward the sun for extended periods or I will be down for at least an hour.
I don't think the game is doing damage. I think those of us with some existing damage or condition are just more sensitive to certain things. I do know that whenever I get new glasses (which I'm due for now), the problem seems less severe. You might want to have your eyes checked. You may need glasses (or new ones).
And one big piece of advice my eye doctor gave me is to make a concious effort to blink while at a computer. Most people don't realize they are staring at the screen and their eyes dry out.