Have him see an ophthalmologist again. I would make sure there is no evidence of traumatic damage to the eye and an eye pressure needs to be checked.
HV
If he hasn't yet seen a neurologist that would be a good next step too. Persistent headache after a blow to the head should be evaluated to check for any other lingering issues.
Thank you and I will have him rechecked. He did see an ophthalmologist last week.