Who should sue for medical malpractice when i receive a hospital acquired bacteria after a cataract removal operation.

I went in for a simple cataract surgery and end up within 48hrs severe pain in my operated eye. I was told i acquired a bacteria that was Hospital related. I had to return to the hospital where i underwent an emergency operation to rectify the problem. Months have passed and i still cannot see clearly after using all the medication that was prescribe. It is a horrible feeling knowing that a simple cataract removal placed me in a 0.08 risk category.