Fungal Culture - Corneal Scraping Questions

Hello sir My father underwent cataract surgery in left eye. The doctor told me that during the surgery he came to know that my father had posterior polar cataract. And during surgery cortex of lens was strongly adherent to posterior capsule. So he had to do anterior vitrectomyou also. After surgery he has blurred vision and now keratitis is cured after the medication. His vision is also improved after 5 days of surgery bt he says that he feels a horse shoe shaped black area in his visual field. . His retina is checked and it's normal. So what can be the reason for disabled black view? Should we wait for 1 month till the medication gets over or should we go for further investigation?Please tell.