Open AccessDual band dual focus optical coherence tomography for imaging the whole eye segment
Author(s) -
Shanhui Fan,
Li Lin,
Qian Li,
Cuixia Dai,
Qiushi Ren,
Shuliang Jiao,
Chuanqing Zhou
Publication year - 2015
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.6.002481
Subject(s) - optical coherence tomography , optics , lens (geology) , materials science , dichroic glass , cornea , tomography , gradient index optics , anterior eye segment , focus (optics) , physics , refractive index
We developed an improved dual band dual focus spectral domain optical coherence tomography (SD-OCT) for in vivo 2D/3D imaging of the whole eye segment, including the whole anterior segment and retina. The system featured two OCT channels with two different bands centered at 840 nm and 1050 nm, which were designed to image the retina and the anterior segments of the eye, respectively. By combing the two probe light beams for co-axial scanning and separating them for focusing at different segments of the eye with a combination of three dichroic mirrors, we not only minimized the loss of the backscattered light from the sample but also improved the imaging depth, scan range and resolution. The full resolved complex (FRC) method was applied to double the imaging depth for the whole anterior segment imaging, with which an imaging depth of 36.71 mm in air was achieved. We demonstrated that this system was capable of measuring the dynamic changes of ocular dimensions, including the asphericity of the cornea and lens, during accommodation.