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Whatever. I already said to leave out the words afferent and efferent but no one listens.
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All I am doing is trying to work out what the passages you quoted actually mean. I cannot work out what "focus" is supposed to mean the way your father used it.
The only way I can make sense of it is if it means "to look at" or "To direct attention to", but even then there are passages where this is problematical, and some of it becomes a bit circular.
But then according to you, it involves redirecting light, and is something the eyes do?
And none of this has brought us a step closer to understanding why he believed the eyes to work that way, or to being able to check if we find those reasons convincing also.