Eye infection. If this is something big.

Around two weeks back something went in my dad's eye which felt like came out...past one week he has started developing swelling and redness in eye. I have switched three doctors as of now and all are saying that its a infection but no one has told what type of infection or what it is. They have been suggesting medicines and asking to wait as it will take time to heal. This morning I noticed the eye skin adjacent to cornea started to bulge out/ soggy / swelling (not sure what it could be). Earlier only the skin covering eye was swelled. As i said its been a week now but we haven't noticed any improvement rather it feels swelling has increased at times. Below are the medicines which we are taking. 1 Homatropine hydrobromide / homat 2 Moxifloxacin & loteprednol etabonate / mahaflox lp 3 carboxymethylcellulose/ lubustar Can someone please suggest what this could be and if these symptoms are normal and if we need some tests or changa anything. I am afraid if this is something big.