"You say you're having trouble seeing into the future?"

"Well done. Your eyesight is better than mine."

Doggy eye chart..w-o-o-f w-o-o-f

"Good memory. Now turn around and let's try it again. I've put the chart on the opposite wall since your last visit."

"Having trouble getting used to your new tri-focals?"

"Cyril didn't have very good depth perception."