For me, vitrectomy surgery (micro incision) was done on Dec 22nd, 2016. Doctors have informed that till one week I will not be able to see anything through the operated eye. After surgery i was able to see silver colour . And on Dec 24th night, i started seeing only red colour background and redness in eye was getting increased, so I have been admitted in hospital and on diagnosis doctors thought it as infection. Now the report of "Gram stain vitreous fluid" test states that no bacteria seen in vitreous fluid. Please advice what might be the reason behind this eye redness.