The Driver’s optics can behave like a normal person’s vision with sunlight

THE SUN CAME up over the freeway and flooded the armor’s optic systems. Cesar shook his head until the whited-out view readjusted. Color flowed back into the world, and he saw the garden, the fences, and the exes out on the street.
“You okay?” asked Gibbs. The hisses and whirrs of his foot blended in with the sounds of the titan as they walked the fence. It was only Cesar’s second time out in the battlesuit, and they were still checking a few things.
“Sunlight made the lenses flare up,” Cesar said. “Just took a minute to adjust.”
Gibbs frowned. “That shouldn’t be happening.”
“Might just be me, y’know. I get all the input direct.”

Excerpt From Ex-Isle, pg 278
Peter Clines
https://books.apple.com/us/book/ex-isle/id989619017