Here the "light" is a metaphor for Jesus' example. Alternate translation: "I have come to show the truth" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "darkness" is a metaphor for living in ignorance of God's truth. Alternate translation: "may not continue to be spiritually blind" (See: [[rc://en/ta/man/translate/figs-metaphor]])