Why do my eyes get red when I stop eye drops after a retinal detachment surgery?

Hello doctor,

I have had a retinal detachment surgery 7.5 months back with silicon oil. Four months back silicon oil was removed and at the same time cataract surgery was also done. This was my right eye. The vision in the eye is 6/9 with glasses in the operated eye and 6/6 in the other one. Since the first surgery 7.5 months back I am on Predforte eye drops. When I taper them off to 1, the eye starts getting red. My last eye exam was a month back and the retina specialist suggested to have one drop morning and evening for another 14 days. He said there is a subtle infection in the eye. However, when I stopped taking the drops after 15 days, the eye got red again and I restarted it and the redness was gone. I am worried about when I will be able to stop it. Can you please explain what may be the reason and how harmful it is to continue? The eye doctor (retina specialist) asked me to recheck after three months.

Thank you doctor,

Yes, you are right. The doctor during last visit has referred to inflammation rather than infection. My eye pressure is normal (every visit they are found normal but as a precaution, I am asked to use the Timolet drops twice daily which I am using regularly. If you suggest I can go to the clinic for checking the pressure every month. My next visit is after a month. Do you think I can wait till that time? Please advise.