Corneal fluorescein test reliability.

Hi, recently I got extremely red eyes and clear water discharge after I ride bike. So, I went to a doctor he gave me some antibiotics, but it didn't work. So, went again to him after two days. Then he prescribed corneal fluorescein test that caught some spots in cornea. I already had a bad direct trauma to that eye which gave some permanent lost corneal cells and which I already slightly altered after that injury. My question is that how reliable that test is in that case because that test shows same pattern as my old injury. After doing that test doctor prescribed some antibiotics with antiviral drugs and anti-allergic eye drops that worked well for me. The discharge is stopped and I am doing well, no pain no vision change (from day 1), only redness remains in eye. I have attached that report as well my infected eye photo. Please answer. I am not in worry, just curious to know!