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Higher order aberrations using the NIDEK OPD-Scan and AMO WaveScan.

Colm McAlinden1, Jonathan E Moore

  • 1School of Biomedical Sciences, University of Ulster, Coleraine, United Kingdom. colm.mcalinden@gmail.com

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|May 5, 2010
PubMed
Summary

The NIDEK OPD-Scan and AMO WaveScan show poor consistency in measuring higher order aberrations, except for Z-1/3 and Z0/4, which have medium consistency. This comparison is crucial for accurate ophthalmic diagnostics.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Optical Engineering

Background:

  • Accurate measurement of higher order aberrations is critical for understanding visual quality and optimizing refractive surgery outcomes.
  • Aberrometry devices, such as the NIDEK OPD-Scan and AMO WaveScan, are essential tools for quantifying these aberrations.
  • Comparing the performance of different aberrometers is necessary to ensure reliable and consistent clinical data.

Purpose of the Study:

  • To compare the measurements of higher order aberrations (HOAs) between the NIDEK OPD-Scan and the AMO WaveScan.
  • To assess the consistency and agreement of HOA measurements obtained from these two distinct aberrometry platforms.
  • To provide reference values for expected aberration measurements from both devices.

Main Methods:

  • Third- to sixth-order higher order aberrations were measured in 1,072 eyes using both the NIDEK OPD-Scan and the AMO WaveScan.
  • Statistical analysis included calculation of means, standard deviations, confidence intervals, and limits of agreement.
  • Intraclass correlation coefficients (ICC) were computed to evaluate inter-instrument consistency.

Main Results:

  • The NIDEK OPD-Scan showed greatest aberration magnitudes for Z-3/3, Z0/4, and Z-1/3, while the AMO WaveScan showed greatest magnitudes for Z-3/3, Z0/4, and Z1/3.
  • The largest difference between devices was observed for the Zernike polynomial Z-3/3.
  • Medium consistency (ICC 0.6–0.8) was found for Z-1/3 and Z0/4, whereas all other HOAs, including total root-mean-square (RMS) aberrations, exhibited poor consistency (ICC < 0.6).

Conclusions:

  • There is generally poor consistency in higher order aberration measurements between the NIDEK OPD-Scan and AMO WaveScan.
  • The Zernike modes Z-1/3 and Z0/4 demonstrated moderate agreement between the two aberrometers.
  • The study reports expected aberration reference values for both instruments, aiding in the interpretation of clinical data.