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I'm trying to understand why *field curvature* would be related to age.
I get that eyesight deteriorates with age as does the ability of the eye to focus, and I get what you're saying about focusing halfway to the edge of the field to keep the inner and outer stars within the circle of confusion.
But correct me if I'm wrong; a curved focal plane is not fixed by shifting the focal point of the eye; instead you would have to be able to change the shape of your retina to accomodate to a curved focal plane, wouldn't you? I don't think people (young or old) are able to do this are they?
Cheers.
Markus
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