TY - JOUR
T1 - Pupil tracking optical coherence tomography for precise control of pupil entry position
AU - Carrasco-Zevallos, Oscar
AU - Nankivil, Derek
AU - Keller, Brenton
AU - Viehland, Christian
AU - Lujan, Brandon J.
AU - Izatt, Joseph A.
N1 - Publisher Copyright:
© 2015 Optical Society of America.
PY - 2015
Y1 - 2015
N2 - To maximize the collection efficiency of back-scattered light, and to minimize aberrations and vignetting, the lateral position of the scan pivot of an optical coherence tomography (OCT) retinal scanner should be imaged to the center of the ocular pupil. Additionally, several retinal structures including Henle’s Fiber Layer (HFL) exhibit reflectivities that depend on illumination angle, which can be controlled by varying the pupil entry position of the OCT beam. In this work, we describe an automated method for controlling the lateral pupil entry position in retinal OCT by utilizing pupil tracking in conjunction with a 2D fast steering mirror placed conjugate to the retinal plane. We demonstrate that pupil tracking prevents lateral motion artifacts from impeding desired pupil entry locations, and enables precise pupil entry positioning and therefore control of the illumination angle of incidence at the retinal plane. We use our prototype pupil tracking OCT system to directly visualize the obliquely oriented HFL.
AB - To maximize the collection efficiency of back-scattered light, and to minimize aberrations and vignetting, the lateral position of the scan pivot of an optical coherence tomography (OCT) retinal scanner should be imaged to the center of the ocular pupil. Additionally, several retinal structures including Henle’s Fiber Layer (HFL) exhibit reflectivities that depend on illumination angle, which can be controlled by varying the pupil entry position of the OCT beam. In this work, we describe an automated method for controlling the lateral pupil entry position in retinal OCT by utilizing pupil tracking in conjunction with a 2D fast steering mirror placed conjugate to the retinal plane. We demonstrate that pupil tracking prevents lateral motion artifacts from impeding desired pupil entry locations, and enables precise pupil entry positioning and therefore control of the illumination angle of incidence at the retinal plane. We use our prototype pupil tracking OCT system to directly visualize the obliquely oriented HFL.
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U2 - 10.1364/BOE.6.003405
DO - 10.1364/BOE.6.003405
M3 - Article
AN - SCOPUS:84948739486
SN - 2156-7085
VL - 6
SP - 3405
EP - 3419
JO - Biomedical Optics Express
JF - Biomedical Optics Express
IS - 9
M1 - A032
ER -