Last night I suddenly started feeling a pain in my right eye with very minor redness. Now the redness has gone, there is no swelling but I unable to look at anything bright - be it a screen or the light in my room or hoarding lights or car lights. Anything bright is causing a pain in my eye. And this is on my right eye only. My vision is fine otherwise, but I'm facing a lot of discomfort. What is the problem and how did I get rid of it?