Your eye is the lamp of your body. When your eyes are good, your whole body also is full of light. But when they are bad, your body is full of darkness.
KJV
The light of the body is the eye: therefore when thine eye is single, thy whole body also is full of light; but when [thine eye] is evil, thy body also [is] full of darkness.
ASV
The lamp of thy body is thine eye: when thine eye is single, thy whole body also is full of light; but when it is evil, thy body also is full of darkness.