“How do you know that carrots are good for your eyes?”/“Have you ever seen rabbits wearing glasses?”

Does eating carrots improve one’s eyesight? A popular riddle is:
 
Q: How do you know that carrots are good for your eyes?
A: Have you ever seen a rabbit wearing glasses?
 
The joke has been cited in print since at least 1946.
 
The riddle is often told at Easter. “How do you know that carrots are good for your eyes?  Cause the Easter bunny doesn’t wear glasses!” was posted on Twitter on April 4, 2010.
 
   
8 December 1946, Pittsburgh (PA) Press, “Reporter’s Notebook” by Gilbert Love, pg. 26, cols. 3-4:
“Rabbits eat carrots, and they always have good eyesight,” he pointed out.
 
“How do you know?” asked a small boy.
 
It was a good question, and it stumped the doctor. But only for a moment.
 
“Did you ever see a rabbit wearing glasses?” he asked.
 
The boy admitted that he never had.
 
12 January 1951, Mount Pleasant (IA) News, pg. 8, col. 7:
Gary Wilmeth: “How do you know that eating carrots is good for the eyes?”
Mrs. Wilmeth: “Well, you’ve never seen a rabbit wearin’ glasses, have you?”
 
25 September 1967, The Times Recorder (Zanesville, OH), “The Office Cat” by Junius, pg. 13, col. 6:
Moe—How do you know eating carrots is good for the eyes?
Joe—Well, you’ve never seen a rabbit wearin’ glasses, have you?
 
3 June 1973, Sunday Herald Advertiser (Boston, MA), Young Folks Page, col. 6:
Jack: How do you know carrots are good for your eyes?
Jill: Did you ever see a rabbit wearing glasses?
 
Google Books
What’s Up, Doc?:
Doctor & Dentist Jokes
Compiled by Charles Keller
Illustrations by Leonard P Kessler
Englewood Cliffs, NJ: Prentice-Hall
1984
Pg. ?:
How do you know carrots are good for the eyes?
You never saw a rabbit wearing glasses, did you?
   
15 February 1998, Los Angeles (CA) Times, “Laugh Lines; Pint-Sized Punch Lines,” pg. E2:
How do you know carrots are good for your eyes? Have you ever seen a rabbit with glasses? (Roco Castaneda, 9, San Bernardino, Hillside School)
 
Google Groups: uk.education.staffroom
A cat’s new year resolutions
tuppence
2/18/02
(...)
How do you know carrots are good for your eyes?
Did you ever see a rabbit with glasses?
 
Southern Maryland Online
101 Easter jokes
jazz lady
04-08-2004, 01:40 PM #1
(...)
Q. How do you know carrots are good for your eyes?
A. Have you ever seen a rabbit with glasses?
   
Twitter
Jan Riley‏
@hawkeye77
RT @wbaustin: Q. How do you know carrots are good for your eyes?
A. Have you ever seen a rabbit with glasses?
http://tinyurl.com/cxb Hap ...
3:41 PM - 12 Apr 2009
 
Twitter
CP‏
@thegoddesscher
How do you know that carrots are good for your eyes?  Cause the Easter bunny doesn’t wear glasses!  *groan* okay, they all can’t be winners
10:34 PM - 4 Apr 2010
 
Twitter
Carl’s Jr of Vegas‏
@carlsjrofvegas
Q. How do you know carrots are good for your eyes?
A. Have you ever seen an Easter bunny with glasses?
8:17 PM - 7 Apr 2012
 
Google Books
The Super, Epic, Mega Joke Book for Kids
By Whee Winn
Grand Rapids, MI: Zonderkidz
2016
Pg. ?:
How do you know carrots are good for your eyes?
Have you ever seen a rabbit with glasses?
 
Twitter
Alex kershaw‏
@AlexkershawTSM
How do you know that carrots are good for your eyes?
...........Have you ever seen a rabbit wearing glasses? #EasterBunny @AdHocGuardians
4:03 PM - 11 Apr 2017