Posted by sandrine on Wednesday, January 6, 2010 at 4:19pm.
Because of the beta carotene.
They are high in Vitamin A, which helps eyesight.
See
http://www.allaboutvision.com/nutrition/vitamin_a.htm
Eating carrots only improves eyesight if a person has a Vitamin A deficiency. Most people in the developed world have sufficient Vitamin A, so eating carrots doesn't help their vision.
http://www.snopes.com/food/ingredient/carrots.asp
http://healthlibrary.epnet.com/GetContent.aspx?token=0d429707-b7e1-4147-9947-abca6797a602&chunkiid=156972
http://www.webmd.com/diet/carrots-good-for-eyes
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