My grandpa is facing a serious redness & swelling in his one eye. Although he's able to see clearly. But every area except the lens is in red color because the blood all around, he's a kidney patient too & sugar/b.p problems as well. I really like to know the reason if the eye problem is related to them problems. Or its just an eye infection. He doesn't feel any kinda pain in eye. But it's dangerously red all over. & swollen. The doctor has also prescribed an eye drop but I'm unable to see the results. It's still as red as it was. I really want to know if it's just a normal eye infection or something else. He had laser treatment in past years too. It's really confusing. Help!