In plain words
The eye sees the form before it through the sun's light; without that light, its seeing ceases. Yet that sun itself shines only by the light of the One. I am that ever-established Self, beyond the form of the organs.
Word for word
The eye illumined by the sun apprehends the form before it; without that illumination, the seeing is absent. Likewise that sun itself shines by the light of the One. I am that Self, without the form of the eye and other organs, ever established.