What causes this? How can it be prevented? any vitamins? medicine? cure?

[help]

I play basketball at a gym. They have a really bright lights on. Every time I run under the bright light, trying to shoot, my eye sort of hurts like i been flashed by the camera or something... I am not really dizzy but It doesnt feel too good. I see like purple colors sort of.... this only happens at the gym or like when really brite lights flashes on me... like during the nite when I play bball like outdoor or like indoor gym where they have really brite lights. I dont know if others are okay.. do people get this? what causes it? what are the treatment?