What are you taking for medication? Perhaps you need a higher
dose, if this is indeed herpes, like 1000 mg of valtrex instead of 500 mg, or switch to acyclovir if you are on valtrex, or even famvir.
If these things weren't cultured, and you were diagnosed by sight, get them cultured ASAP. You should be seeing an ophthalmologist for your eye - don't let your regular doctor handle this.