Parallel
Matthew 6:22
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light.
The eye is the lamp of the body. If your eyes are good (note: Literally If your eye is sound; see Proverbs 22:9), your whole body will be full of light.