Post Cataract surgery. For a minute.

Edited and posting again: Hi My dad is 66 years old and had underwent Cataract surgery for both his Eyes 5 months back, and the Doctor told to wear the Sunglasses For 1 month while stepping out of home, and It's been 5 months now But till now if he steps out from the house Even for 2 minutes, he feels totally uncomfortable (but he is comfortable during night time lights) when we spoke to the doctor she said he has Dry eyes so the recovery will be slow and other than that he is perfectly fine. Currently he is using eye drops for 3 times a day and Gel in the night time as per the doctor's advise. And the doctor advised him to use photochromic Glass and he is using it for the past 4 months and he is comfortable when wearing it inside the house but the moment he steps out of the house he finds it very difficult. But I want to know when will he can step out without the sunglasses again (doctor said no need to use sunglasses but he can't  step out like before even for a minute . Thanks