If they're not prism-balanced (basically what they do with cat's eye lenses to keep them vertical, as contacts normally spin a little against your eye as you wear them but with round shapes, nobody notices- most cheaper lenses WON'T be so balanced), cats eyes could work, but it'd take a bit for them to "spin" back around to horizontal.
Help me get rid of my parasprite swarm!
Originally Posted by Moofingham
There is a vibe here that says "We're in this together! Through thick and thin fabric! Through cold water washes and burning hot irons! Though we might super glue ourselves to our projects, cut holes/gashes/oh-god-mom's-gonna-kill-me into the dining room table, we will stand strong together. Unless there is a 75% off sale at the Fabric store. Then you're on your own. And get the hell out of my way." <3