The phrase apple of my eye, according to the urban dictionary, means…
One’s favorite person; the one you love most.
In Old English, the pupil of the eye (the round, dark center) was called the ‘apple’. It was thought that the pupil was a round object much like an apple (a piece of fruit). When you look at someone, their reflection appears in your pupil. So if someone is the ‘apple of your eye’, he or she is someone that you look at a lot and enjoy seeing.
This original 6″x6″ oil painting on 1/8″ gesso panel is available, unframed, for $100 here.