Kitten's eye infection?

Recently I found 2 stray 8 week old kittens. I took them to the vet yesterday he said one of them had an eye infection and gave me antibiotics for him and to keep the eye clean. I looked at him this morning and the infection has caused one of his eyes to stick shut. Should I try pry the eye open or just keep it clean and wait for it to open on its own with the antibiotics?