I know this is an old post but I was having a read through and thought I would share some info I have on this. I too, recently had very similar symptoms to yourself.....bloodshot eye, sore to pressure around it and very light sensitive.(which was fabulous I can tell you since my job involves looking down a microscope for lengthy periods....annoying!!!) I was sent ASAP to see my GP (as per phone conversation with my rheumy) and he said it wasn't actually iritis. Apparently, just as we experience inflammation in other areas, some people experience inflammation of the optic nerve which give these symptoms. I was told it was not as severe or damaging to your eyesight as iritis can be and generally sorts itself out in a few days (which mine did). This is of course not to say that you should ignore any eye symptoms and they should always be checked just incase.
Hope this helps alittle.
Cheers
Nel