Question: why is it called apple of my eye

title: Apple of my eye
text: Gregory I. Pope ( January 1 , 1999 ) . King Alfred 's West - Saxon Version of Gregory 's Pastoral Care . Elibron.com . p. 68 . ISBN 978 - 1 - 4021 - 9636 - 2 . Retrieved October 17 , 2012 .