# The eye is the lamp of the body
"A person's eyes are like a lamp for his body"
# if your eye is good
Jesus speaks of the eye to talk about what a person thinks about and wants. Alternate translation: "if your eye is noble" or "if your eyes see clearly."
# the whole body is filled with light
Possible meanings are 1) "you are full of righteousness" or 2) "you understand what is truly good"