"... Expressions in the Old Testament imply that the Jews thought of the eye as having its own light. 'The light of my eyes – it also has gone from me' (Psalm 38[27]:10), 'The light of the eyes rejoices the heart' (Proverbs 15:30), 'The Lord gives light to the eyes' (Proverbs 29:13). In Tobit 10:5 we read: 'my child, that I let you go, you who are the light of my eyes'. Though these expressions could be interpreted metaphorically, the point of reference relies on common knowledge of the functioning of the eye. In eight places we read that eyes became darkened (Genesis 27:1; 48:10; Deuteronomy 34:7; 1 Samuel 3:2; Job 17:7; Psalm 69:23; Lamentations 5:17; Zechariah 11:17). The most natural explanation for this metaphor is to recognize the correlation between the eye and the sun. As the heavenly source of light darkens, so too can the bodily source of light dim. In Daniel 10:2–9, Daniel has a vision of a glorious man. He describes him: 'His body was like beryl, his face like the appearance of lightning, his eyes like flaming torches...' (Daniel 10:6). Zechariah tells of a vision in which he saw a lamp stand and seven lamps on it (Zechariah 4:1–14). The record of this vision is followed by a conversation with an angelic interpreter who concludes: 'These seven are the eyes of the Lord, which range through the whole earth' (Zechariah 4:10) ..."