It is good that the fungal corneal infection or ulcer is healing. About the vision your doctor will only be able to answer, as it depends on the location of the ulcer and intensity of the lesion. Every corneal ulcer leaves a scar, and if this affects the optical properties of cornea, vision will remain deficient. However contact lenses or glasses could help in some. Follow your doctor's advice meticulously. Use drops properly till the infection is completely routed out.