Quote:
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When the brain forces a focusing of the light through the eyes, the lens obviously is moving or changing to make certain accommodations.
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Ok, so when you use the word "Focus" you mean "changing the lens in order to redirect light in such a way as to allow us to see a clear image"
Which i a rough and oversimplified way is the same as in optics.
But that is an inherently afferent process, and it does not work if you try to replace "focus" with that sentence in the book.