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Large dynamic range autorefraction with a low-cost diffuser wavefront sensor.

Gregory N McKay1, Faisal Mahmood1, Nicholas J Durr1

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|May 8, 2019
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Summary
This summary is machine-generated.

A novel diffuser wavefront sensor (DWFS) offers a low-cost, high-accuracy method for measuring eye aberrations. This technology significantly improves dynamic range and the number of measurable prescriptions compared to traditional methods.

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Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Metrology

Background:

  • Traditional lenslet array aberrometry faces limitations in cost and dynamic range.
  • Wavefront sensing using diffusers presents a promising low-cost alternative.
  • Accurate wavefront measurement is crucial for eyeglass prescription and diagnosing visual impairments.

Purpose of the Study:

  • To evaluate the performance of a diffuser wavefront sensor (DWFS) for aberrometry.
  • To compare the dynamic range, precision, and prescription resolution of DWFS against a Shack-Hartmann wavefront sensor (SHWFS).
  • To demonstrate the potential of DWFS for accurate eyeglass prescription measurements.

Main Methods:

  • Developed a diffuser wavefront sensor (DWFS) utilizing caustic pattern displacement tracking.
  • Employed a multi-level Demon's non-rigid registration algorithm to analyze wavefront aberrations.
  • Induced spherical and cylindrical errors in a model eye for comparative analysis with SHWFS.

Main Results:

  • DWFS achieved a ~5-fold improvement in dynamic range (-22.0 to +19.5 D) compared to SHWFS (-4.0 to +4.5 D).
  • DWFS exhibited a ~3-fold increase in resolvable prescriptions (358 vs. 118) with higher accuracy.
  • The resolution of DWFS was only marginally reduced (0.116 D vs. 0.072 D) compared to SHWFS.

Conclusions:

  • Diffuser wavefront sensing offers a low-cost, high-dynamic-range solution for aberrometry.
  • DWFS provides sufficient accuracy for eyeglass prescription measurements.
  • The unique properties of diffusers enable superior aberration measurement capabilities over lenslet arrays.