Another eye infection

I can't seem to understand why I am having all these eye infections.  9 months ago I had a case of Wet MD and was given Avastin and have been stable since the one injection, thanks be to God.  Since then it seems like I have had infection after infection in that eye. I went through a dry eye spell but the Restasis seems to have really helped that.  

Monday I went back to the eye doc for the 100th time it seems. For a couple of days my left eye was a little blurry (which always scares a person with md). It was also red, bottom eyelid puffy, and felt like something was in it.  He looked and said Macula was stable, my vision had went from 20/25 to 20/30 in that eye, he attributed that to the fact that he said I had irritation under my upper eye lid and scratches on my cornea ( not sure what all that means or how it happens). He said the drops should improve condition quickly.

He prescribed PREDNISOLONE ACETATE OPHTHALMIC SUSPENSION- ONE DROP LEFT EYE THREE TIMES DAILY. I have used this for two days and have seem NO improvement. My eye still itches, its still red, puffy and my vision is not up to par.  

What can I do and Why do I keep getting these infections?

[John C Hagan III, MD, FACS, FAAO]

Already answered

JCH III MD