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Systematic error of a large dynamic range aberrometer.

Peng Wu1, Edward DeHoog, Jim Schwiegerling

  • 1College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA.

Applied Optics
|November 12, 2009
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Summary
This summary is machine-generated.

Shack-Hartmann aberrometry can introduce spherical aberration due to imaging lens pupil aberrations. This systematic error, linked to wavefront power error, is demonstrated through simulations and experiments.

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Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Metrology

Background:

  • Shack-Hartmann aberrometry is a standard technique for quantifying ocular aberrations.
  • A specific aberrometer configuration involves relaying lenslet images onto a sensor.

Purpose of the Study:

  • To investigate the systematic introduction of spherical aberration in a Shack-Hartmann aberrometer configuration.
  • To identify the primary source of this induced spherical aberration.

Main Methods:

  • Utilized simulations to model the optical system.
  • Conducted experimental measurements to validate simulation findings.
  • Analyzed the impact of pupil aberration in the imaging relay lens.

Main Results:

  • Observed a systematic spherical aberration strongly correlated with wavefront power error (defocus).
  • Identified the imaging relay lens's pupil aberration as the dominant contributor to this error.
  • Presented simulation and experimental data supporting the findings.

Conclusions:

  • The investigated Shack-Hartmann aberrometer configuration is susceptible to induced spherical aberration.
  • Pupil aberration of the imaging relay lens is a critical factor influencing measurement accuracy.
  • Understanding and mitigating this error is essential for precise ocular aberration measurements.