I'm really worried about my dad. He's 66 and had cataract surgery on both eyes about 5 months ago. His doctor mentioned that he should wear sunglasses for a month whenever he went outside, but it's been 5 months and he still feels really uncomfortable when he steps out, even if it's just for a couple of minutes. At night, he seems fine with the lights, so that's a relief. The doctor said he has dry eyes which might be causing the slow recovery. He's using eye drops three times a day and a gel at night as the doctor advised. He's also been wearing photochromic glasses for the past 4 months and feels okay with them indoors, but as soon as he goes outside, it's really tough for him. I'm just curious when he might be able to go out without feeling the need for sunglasses again because, despite what the doctor said, stepping out even for a short time is hard for him right now. What could be going on?