Ask the Doctor: Why is the infection in my left eye recurring?

Dear Doctor, In December, I had eye pains and after treatment on eyedrops for a month, it was recommended I get on specs. However, by then, I had what the doctor said was an eye infection. In the mornings, I would wake up with some dry pus allover my left eye. Another eyedrop was prescribed and it seemed to help, but now that it is finished, the pain is back and the pus too. What could be such an infection and do I need to use eyedrops like forever now? Edwin, Remera