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Axial eye-length measurement by wavelength-shift interferometry

A Sekine1, I Minegishi, H Koizumi

  • 1Technical Research Group, Topcon Corporation, Ltd., Tokyo, Japan.

Journal of the Optical Society of America. A, Optics and Image Science
|July 1, 1993
PubMed
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A new noncontact method accurately measures axial eye length using laser diode technology. This simplified technique offers a wide measurement range, crucial for ophthalmology and vision research.

Area of Science:

  • Ophthalmology
  • Biomedical Optics
  • Metrology

Background:

  • Accurate axial eye length measurement is critical for refractive error assessment and surgical planning.
  • Existing noncontact techniques may have limitations in range or complexity.

Purpose of the Study:

  • To develop and evaluate a simplified, noncontact technique for measuring axial eye length.
  • To assess the performance of this new method in terms of measurement range and accuracy.

Main Methods:

  • A single-mode laser-diode beam is used to measure the phase shift of interference fringes from corneal and retinal reflections.
  • Pulse-modulation drive and reference path signals enable high-speed measurements.
  • Optical distance is calculated from the measured phase shift.

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Main Results:

  • The technique provides a wide measurable range of 16-32 mm.
  • Measurements on 21 adults yielded a standard deviation of +/- 0.11 mm.
  • While less accurate than partially coherent light methods, it offers a broader measurement capability.

Conclusions:

  • This simplified noncontact laser-diode technique is suitable for axial eye length measurement.
  • Its wide range makes it advantageous for specific clinical and research applications.
  • Further refinement may improve accuracy while maintaining its broad applicability.