This Morning's resident doctor Dr Chris Steele MBE was shown undergoing eye surgery on Thursday's show.
Viewers watched footage filmed the day before of cataract surgery on his left eye, which Dr Chris had under local anaesthetic at the Optegra Eye Hospital in his hometown of Manchester through the NHS.
Cataract surgery replaces the cloudy lens behind the iris with an artificial plastic lens to improve eyesight.
Speaking before the operation, Dr Chris, 70, said "anyone knowing there'll be a surgeon putting a scalpel in your eye, it's natural to have slight reservations" but he said that he had already had the right eye done and "I didn't feel a thing".
Talking to hosts Phillip Schofield and Holly Willoughby via a live link to the studio just a day after the surgery, Dr Chris said he was "seeing in high definition at last".
He said: "I was only in the operating theatre for 30 minutes, 10 minutes after that I'm on the way home.
"I'm absolutely fine, it's 24 hours since the operation and I've got great vision in both eyes."
He continued: "I was having double vision but no pain or discomfort and overnight that double vision disappeared and now I'm not having to wear glasses.
"Not only are things sharper, but colours are more intense than before the operation."
Asked what the experience was like, Dr Chris said: "The main concern when patients hear they've got to have cataract surgery and not having a general anaesthetic, they think I'm lying on the operating table, I'm awake, I'll see the surgeon, the scalpel, I've got to keep my eyes still. No, there's none of that.
"All I could see was white, I couldn't see anything at all, I couldn't feel anything at all.
"I had my right eye done four weeks ago, I was actually looking forward to having my left eye done yesterday."
Dr Chris said it was his idea to film the operation for the ITV show because he "wanted to show how easy and remarkable the intricate surgery is now and to stop people being terrified of it."
Cataracts are the most common cause of treatable blindness
He has appeared on the show as its resident health expert since the first episode in 1988 and is the longest serving member of the This Morning team.
Viewers found the segment very informative.
Of course, there's always one who's too busy examining Dr Chris' settee when they showed him at his home.