Raph hated his eyes. Out of all of his family his eyes were the least human.
Donnie and Splinter had brown eyes, Leo and Mikey had blue eyes and Raph was the odd one with yellow eyes.
When his brothers took off their masks to relax, Raph kept his on; hiding his abnormal yellow orbs behind the whites of his mask.
Raph would wear his mask sometimes when he and Mikey hung out. Mikey usually made him take it off, he loved Raph's eyes most of all. He only wished that Raph could see their beauty through his eyes.