Sorry to hear about Wylie. I don't have really any advice but just sending good vibes your way.
One of my fosters Dakota had a cataract in one eye. Her other eye was missing, lost in a dog fight
. She was about 8 yrs old when I fostered her. But I don't know how long she'd had it. She could see plenty good during the day. At dusk was when she had trouble. I remember one time I took her outside to pee around dusk. She was her old happy self running around and waggin her little stump. She ran right into the truck of a palm tree. I felt bad that I was laughing so hard but it was too funny! She was fine btw.