Purripheral vision 

When everywhere you look there are cats.

When he walked into the cat lady's house, there were contented cats lying about on every surface. He felt like he had purripheral vision.

Purripheral vision by Shamaniac August 15, 2019

pervipheral vision 

Checking out someone out of the corner of your eye so as to avoid staring, suspicion or the wrath of your significant other.

Kelly: "Check out the booty on that babe!"
Darren: "Already got her in my pervipheral vision".

pervipheral vision by drdigg August 21, 2013