Firstly, I'm not in the medical profession.
I do think that it sounds as though your cousin has a scratched cornea - and MUST get medical treatment immediately - if left untreated it could permanently affect their sight, and could get infected. It will probably have to be covered to protect it from bright light and dust, and some sort of treatment in the form of drops for at least a few days I would imagine.
Sight is precious - please tell him to see an optician urgently (ie today), or go to the emergency room - if it is swollen and red it sounds like an emergency to me.
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Time is an illusion. Lunchtime doubly so.
Epona of The Laughing Hyenas
Proud winner of the 'Most Useless Post 250 Has Ever Seen' Award 2001. "I'd just like to thank my friends and family, without whom none of this would have been possible..."