How do you build a Shack-Hartmann aberrometer?

• The SH-aberrometer has an objective lens like the compound eye of an insect

• Reflected light is broken into separate beams, producing multiple images of the same retinal spot.

“The last thing a fly ever sees”

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A Shack-Hartmann aberrometer has an objective lens which is actually an array of tiny lenses, rather like the compound eye of an insect.

With this kind of lens, the reflected light is broken into many individual beams, thereby producing multiple images of the same retinal spot of light.

To see how these spots of light can be used to determine the shape of the wavefront, we need to look at the wavefront in cross-section.