Research Papers

Twisted-nematic liquid-crystal-on-silicon adaptive optics aberrometer and wavefront corrector

[+] Author Affiliations
Seow-Hwang Eng

Edith Cowan University, School of Engineering, 270 Joondalup Drive, Joondalup, WA 6027, Australia

Fred Reinholz

Edith Cowan University, School of Engineering, 270 Joondalup Drive, Joondalup, WA 6027, Australia and Lions Eye Institute, Lasers and Bioengineering Group, 2 Verdun Street, Nedlands, WA 6009, Australia

Douglas Chai

Edith Cowan University, School of Engineering, 270 Joondalup Drive, Joondalup, WA 6027, Australia

J. Biomed. Opt. 14(4), 044014 (July 27, 2009). doi:10.1117/1.3183814
History: Received February 20, 2009; Revised May 27, 2009; Accepted May 27, 2009; Published July 27, 2009
Text Size: A A A

A Hartmann-Shack wavefront sensor (HSWS) has been proven to be a reliable tool for the quantitative analysis of human ocular aberrations. In an active adaptive optics (AO) system, it has the role to monitor wave aberrations. To ensure the exclusive retrieval of Zernike coefficients for the measured ocular wavefronts, we first nullify the AO system’s aberrations. This is of particular importance in our setup with a twisted-nematic (TN) liquid-crystal-on-silicon (LCoS) chip as the wavefront manipulator due to its strong unwanted zero-order diffractive beam. We characterize the AO system’s performance—before and after ocular corrections—by means of different parameters, including experimental and simulated point spread functions (PSFs). An iterative closed-loop algorithm reduces the residual wavefront error to typical values of 0.1μm. This system constitutes a wavefront corrector that can possibly be used for high resolution retinal imaging purposes or for visual psychophysical experiments.

Figures in this Article
© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Seow-Hwang Eng ; Fred Reinholz and Douglas Chai
"Twisted-nematic liquid-crystal-on-silicon adaptive optics aberrometer and wavefront corrector", J. Biomed. Opt. 14(4), 044014 (July 27, 2009). ; http://dx.doi.org/10.1117/1.3183814


Tables

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.