Pfirst off, I'm a huge pfan too... In the third grade, a bunch of kids bullied me for stealing a catwoman paper plate at a birthday party just because I thought she was so damn hot. Looks like I just had good taste early on in life
I think the translucent contact look would be really damn weird. For me, the white eyes are about dehumanizing him. When we need him to be human, like if he's talking to a real young kid, or talking somebody off a ledge, the lenses can certainly retract. I also think, as others have suggested, that a more flexible cowl would allow him the eyebrow movement and change in eye shape necessary to "emote" with the lenses on.
Here's another Fleck because... I... can't.... stop......