Ultra-compact switchable SLO/OCT handheld probe design

Francesco LaRocca; Derek Nankivil; Theodore DuBose; Sina Farsiu; Joseph A. Izatt

doi:10.1117/12.2077754

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20 March 2015 Ultra-compact switchable SLO/OCT handheld probe design

Francesco LaRocca, Derek Nankivil, Theodore DuBose, Sina Farsiu, Joseph A. Izatt

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Proceedings Volume 9307, Ophthalmic Technologies XXV; 93071F (2015) https://doi.org/10.1117/12.2077754
Event: SPIE BiOS, 2015, San Francisco, California, United States

Abstract

Handheld scanning laser ophthalmoscopy (SLO) and optical coherence tomography (OCT) systems facilitate imaging of young children and subjects that have difficulty fixating. More compact and lightweight probes allow for better portability and increased comfort for the operator of the handheld probe. We describe a very compact, novel SLO and OCT handheld probe design. A single 2D microelectromechanical systems (MEMS) scanner and a custom optical design using a converging beam prior to the scanner permitted significant reduction in the system size. Our design utilized a combination of commercial and custom optics that were optimized in Zemax to achieve near diffraction-limited resolution of 8 μm over a 7° field of view. The handheld probe has a form factor of 7 x 6 x 2.5 cm and a weight of only 94 g, which is over an order of magnitude lighter than prior SLO-OCT handheld probes. Images were acquired from a normal subject with an incident power on the eye under the ANSI limit. With this device, which is the world’s lightest and smallest SLO-OCT system, we were able to visualize parafoveal cone photoreceptors and nerve fiber bundles without the use of adaptive optics.

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Francesco LaRocca, Derek Nankivil, Theodore DuBose, Sina Farsiu, and Joseph A. Izatt "Ultra-compact switchable SLO/OCT handheld probe design", Proc. SPIE 9307, Ophthalmic Technologies XXV, 93071F (20 March 2015); https://doi.org/10.1117/12.2077754

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