One pupil larger than the other but ophthalmologist says no problems other than mild corneal haze. is differing pupil sizes not concerning?

Anisocoria: It can be an entirely harmless condition. It is reassuring to have the Specialist assessing your condition.

Correct: You should not worry about it if your ophthalmologists has already check it out.

Differing size pupil: This can be a problem and should be evaluated by an ophthalmologist. Sometimes it is called an Adies pupil that is not serious. It is usually not associated with corneal haze. I am not sure why you have the haze but that should be addressed.