# 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"