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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 9 — Oct. 3, 2011

High-resolution retinal imaging with micro adaptive optics system

Saisai Niu, Jianxin Shen, Chun Liang, Yunhai Zhang, and Bangming Li  »View Author Affiliations


Applied Optics, Vol. 50, Issue 22, pp. 4365-4375 (2011)
http://dx.doi.org/10.1364/AO.50.004365


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Abstract

Based on the dynamic characteristics of human eye aberration, a microadaptive optics retina imaging system set is established for real-time wavefront measurement and correction. This paper analyzes the working principles of a 127-unit Hartmann–Shack wavefront sensor and a 37-channel micromachine membrane deformable mirror adopted in the system. The proposed system achieves wavefront reconstruction through the adaptive centroid detection method and the mode reconstruction algorithm of Zernike polynomials, so that human eye aberration can be measured accurately. Meanwhile, according to the adaptive optics aberration correction control model, a closed-loop iterative aberration correction algorithm based on Smith control is presented to realize efficient and real-time correction of human eye aberration with different characteristics, and characteristics of the time domain of the system are also optimized. According to the experiment results tested on a USAF 1951 standard resolution target and a living human retina (subject ZHY), the resolution of the system can reach 3.6 LP / mm , and the human eye wavefront aberration of 0.728 λ ( λ = 785 nm ) can be corrected to 0.081 λ in root mean square (RMS) so as to achieve the diffraction limit (Strehl ratio is 0.866), then high-resolution retina images are obtained.

© 2011 Optical Society of America

OCIS Codes
(220.1000) Optical design and fabrication : Aberration compensation
(110.1085) Imaging systems : Adaptive imaging
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Imaging Systems

History
Original Manuscript: May 3, 2011
Revised Manuscript: June 10, 2011
Manuscript Accepted: June 15, 2011
Published: July 27, 2011

Virtual Issues
Vol. 6, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Saisai Niu, Jianxin Shen, Chun Liang, Yunhai Zhang, and Bangming Li, "High-resolution retinal imaging with micro adaptive optics system," Appl. Opt. 50, 4365-4375 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-50-22-4365

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