Optical Review

, 15:173

Adaptive optics fundus camera using a liquid crystal phase modulator

  • Tatsuo Yamaguchi
  • Naoki Nakazawa
  • Kenichiro Bessho
  • Yoshiyuki Kitaguchi
  • Naoyuki Maeda
  • Takashi Fujikado
  • Toshifumi Mihashi
Regular Papers

DOI: 10.1007/s10043-008-0028-6

Cite this article as:
Yamaguchi, T., Nakazawa, N., Bessho, K. et al. OPT REV (2008) 15: 173. doi:10.1007/s10043-008-0028-6

Abstract

We have developed an adaptive optics (AO) fundus camera to obtain high resolution retinal images of eyes. We use a liquid crystal phase modulator to compensate the aberrations of the eye for better resolution and better contrast in the images. The liquid crystal phase modulator has a wider dynamic range to compensate aberrations than most mechanical deformable mirrors and its linear phase generation makes it easy to follow eye movements. The wavefront aberration was measured in real time with a sampling rate of 10 Hz and the closed loop system was operated at around 2 Hz. We developed software tools to align consecutively obtained images. From our experiments with three eyes, the aberrations of normal eyes were reduced to less than 0.1 μm (RMS) in less than three seconds by the liquid crystal phase modulator. We confirmed that this method was adequate for measuring eyes with large aberrations including keratoconic eyes. Finally, using the liquid crystal phase modulator, high resolution images of retinas could be obtained.

Key words

adaptive optics liquid crystal phase modulator Shack-Hartmann wavefront sensor retina fundus camera 

Copyright information

© The Optical Society of Japan 2008

Authors and Affiliations

  • Tatsuo Yamaguchi
    • 1
  • Naoki Nakazawa
    • 1
  • Kenichiro Bessho
    • 2
    • 1
  • Yoshiyuki Kitaguchi
    • 2
    • 1
  • Naoyuki Maeda
    • 3
    • 1
  • Takashi Fujikado
    • 2
    • 1
  • Toshifumi Mihashi
    • 1
  1. 1.Topcon CorporationTokyoJapan
  2. 2.Department of Applied Visual ScienceOsaka University Graduate School of MedicineOsakaJapan
  3. 3.Department of OphthalmologyOsaka University Graduate School of MedicineOsakaJapan

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