Wavefront glasses

In article
<1be7ac7c-c14e-468b-8796-(E-Mail Removed)>,
"Dr. Leukoma" <(E-Mail Removed)> wrote:

> Any change to the cornea can increase higher orders. Orthokeratology
> and refractive surgery increase higher orders while simultaneously
> reducing lower orders.

For someone who wants to dig a bit deeper, look up aplanatic lenses.
Aplanatic lenses work well for a pair of conjugate points but reduce
resolution as you go to points away from the design.

In microscopy, a spherical element is often the the one closest to the
object and is free from monochromatic aberration. Oil with the same
index as the glass contacts the object. This oil increases the numerical
aperture compared to lenses without oil, As indicated by Dr. Leukoma for
eyes, the "perfect" performance degrades faster away from the design
point than if there were no aplanaticity.

Bill

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