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Fausset's Bible Dictionary
Apple of the Eye
The promise is in Zechariah 2:8, "He that toucheth you toucheth the apple of His eye"; the prayer is Psalms 17:8 "Keep me as the apple of the eye"; the fulfillment Deuteronomy 32:10, "He kept him as the apple of His eye." A different Hebrew word from tappunch , namely, ishon , "little man," i.e. "pupil" (Greek kore ) of the eye. Called so from the image formed on the retina. The part most precious and most guarded from attack; which feels most acutely the least hurt, and the loss of which is irreparable.
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Fausset, Andrew R. Entry for 'Apple of the Eye'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/a/apple-of-the-eye.html. 1949.