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Geoff, my understanding from reading Roland's posts is that by keeping the incoming rays of light parallel as they enter the eye you allow the lens to maintain the shape necessary for distance vision. At infinity focus the rays are parallel, and by using 1.5 diopter reading glasses the rays entering the eye are roughly parallel for close vision. Like Mike said we need an expert on board.
I tend to have faith in Ronland's posts since he's been building refractors for a long time.
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