Ocular aberrometry with a wide dynamic range for assessing vision performance and anterior segment imaging that provides anatomical details of the eye are both essential for vision research and clinical applications. Defocus error is a major limitation of digital wavefront aberrometry (DWA) as the blurring of the detected point spread function (PSF) results in a significant reduction of SNR beyond ±3 D range. With the aid of Badal-like precompensation of defocus, the dynamic defocus range of the captured aberrated PSFs can be effectively extended. We demonstrate a dual-modality MHz VCSEL-based swept-source OCT (SS-OCT) system, with an easy switch between DWA and OCT imaging mode. The system is capable of measuring aberrations with defocus dynamic range of D as well as providing fast anatomical imaging of the anterior segment at an A-scan rate of 1.6 MHz. The dual-mode system stands out for its modular design wherein simple hardware additions to an SS-OCT system enable the aberration measurement in DWA mode. In DWA mode, a diffraction-limited stationary spot is formed at the retina by a narrow illumination beam. The reflected light passes then through the full pupil of the eye, thereby the single path optical aberrations are captured. The OCT detection leads to volumetric PSFs, which are post-processed using the digital lateral shearing-based digital adaptive optics technique (DLS-DAO) to reconstruct the wavefront error. Capturing both optical and anatomical information of the eye can be potentially helpful for improved diagnosis and targeted treatment of ocular diseases.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.