Summary: Ray aberration description

• Purpose of S-H-S aberrometer is to measure the ray aberration of the eye at multiple pupil locations.

• Principle of operation:

  • objective Scheiner’s disk,
  • with multiple apertures of a Hartmann screen,
  • each aperture is a lenslet in a 2-D Shack array.

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To summarize this ray-optics description,

the purpose of the Scheiner-Hartmann-Shack aberrometer is to measure the ray aberration of the eye at multiple pupil locations. This is accomplished with a modified, objective form of the classic Scheiner’s Disk in which there are now multiple apertures,