I would ask the doctor for a short course of Terbinafine, followed by Itraconazole. If he says no I would ask another doctor until I found one that signed off on an antiungal.
This definitely sounds like a fungal infection of the eye. No treatment is an absolutely absurd response. That is like saying they aren't willing to even try. What is wrong with these doctors?!
Terbinafine is the safest of the three so it should be tried first. If it will help at all you will feel it working shortly after taking it. If you dont then move on to the 'azoles'.
These drugs are all fungistatic and work by interfering with growth of the fungus.
Fluconazole when combined with Doxycycline is fungicidal and may be your best option.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3393430/
If it persists I would ask for an extended course of Fluconazole as it has the best penetration in the CSF of the three.
Inside the eye Fluconazole and Doxy. The outer layer of the cornea Itraconazole. Behind the eye, Terbinafine.
Another possible treatment with little risk is Natamycin eye drops. There is no valid reason a doctor could come up with to deny you this GRAS food additive that doubles as an antifungal eye drop.
I am thoroughly convinced these drugs saved me from going blind in the left eye from a fungal induced retinal detachment. Contact me by email if I can be of further assistance.
/www.ncbi.nlm.nih.gov/pmc/articles/PMC88956//academic.oup.com/cid/article/53/3/262/289881/Ocular-Manifestations-of-Candidemia