I’ve noticed that when I’ve been Fasted for a while my vision gets better, my eyesight isn’t that bad to begin with as I can see just fine, but while I’m fasted my eyes pickup more detail, the best example I can give is I notice the fibers on clothes alot more, the ground looks more detailed
Fasting helps blood sugar levels and diabetics are known to have less than optimal vision so I think it makes sense that vision improves with fasting. The Reverend Al Sharpton lost all that weight a while ago and spoke about how his vision has improved because of it.
That’s perfectly normal, you’ll probably also notice your mind becomes sharper and your hearing improves too. It’s just part of evolution and a survival trait. When you’re fasting your body goes into “hunter gatherer” mode and your senses heighten to make you a more efficient hunter.