You've seen this if you ever used a magnifying glass to start a fire with sunlight--the lens in your eye can act just like the magnifying glass.
(You; 've seen; this) (you; can act; just like the magnifying glass) (you; used; a magnifying glass; to start a fire with sunlight; T:ever) Context(you used,List([20, 33))):(you; used a magnifying glass to start; a fire; with sunlight)
you used,List([20, 33))
You you you you
've seen can act used used a magnifying glass to start
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just like the magnifying glass
a magnifying glass to start a fire with sunlight T:ever
a fire with sunlight