Who's Line Is It Anyway? alum Colin Mochrie has suffered a detached retina requiring emergency surgery. Mochrie, 68, went into surgery on Friday, January 2, the team behind his show, HYPROV: Improv Under Hypnosis, announced via Instagram that day. "We regret to inform you that our upcoming shows will be postponed due to a medical situation involving Colin Mochrie," read a statement by "The Hyprov Team." Their message continued, "Colin has been diagnosed with a detached retina and will be undergoing emergency eye surgery today.