You need to have a culture taken and have it analyzed/raised in a lab. If your ophthalmologist won't do it, find someone who will, perhaps an internist. That should give a definitive cause. Until you get it diagnosed you're chasing unknown territory. Since I've practiced urine therapy for many years almost all of my eye problems have disappeared and even my glaucoma pressure has subsided. I've also used a clean eye wash cup and rinsed my eyes with my own fresh urine. There's a bit of a sting at first, but then a refreshing cleanse. "Murine" is urine/urea with an M added. Don't knock it. Fresh urine is an antiseptic. It has cured my athlete's foot of many years standing and other skin problems as well.
Bimatoprost is used to for the treatment of the glaucoma (open-angle type) or other eye diseases (e.g., ocular hypertension). It lowers down the high pressure inside the eye which helps to prevent blindness. This medication works by regulating the blood supply in the eye vessels and maintain a normal pressure.
How To Use
Bimatoprost is an eye drop, this medicine is not to consume orally. It is preferred to put this eye drops in the eyes at the evening time. Before using bimatoprost you should wash your hands. Be careful that dropper will not touch tip of the eye or any other surface there is a chance of contamination. If you are using contact lenses then remove it while applying bimatoprost there is a possibility that the soft lens of the contact lens will absorb the medicine. You can apply back the contact lens 15 minutes after the use of bimatoprost. Don’t rinse off the dropper after its use. Replace the cap of dropper after its use.