Longitudinal chromatic aberration compensation method for dual-wavelength retinal imaging adaptive optics systems

Dual-wavelength retinal imaging adaptive optics systems are suitable for high contrast and resolution imaging of retinal capillaries. The compensation of the Longitudinal Chromatic Aberrations (LCAs) in dual-wavelength adaptive systems is researched. The LCA is measured, the measured wavefronts are analyzed, and the arbitrary wavefront LCA compensation method is given. An adaptive correction experiment is carried out and the experimental results indicate that the root mean square error of the wavefront is reduced to 0.16 lambda (lambda=589 nm) and the retinal capillary resolution is improved to 6 mu m. This work may be used for the clinical applications of retinal imaging.