A holographic waveguide based eye tracker

Changgeng Liu; Beatrice Pazzucconi; Juan Liu; Lei Liu; Xincheng Yao

doi:10.1117/12.2290065

19 February 2018 A holographic waveguide based eye tracker

Changgeng Liu, Beatrice Pazzucconi, Juan Liu, Lei Liu, Xincheng Yao

Proceedings Volume 10474, Ophthalmic Technologies XXVIII; 104741T (2018) https://doi.org/10.1117/12.2290065
Event: SPIE BiOS, 2018, San Francisco, California, United States

Abstract

We demonstrated the feasibility of using holographic waveguide for eye tracking. A custom-built holographic waveguide, a 20 mm x 60 mm x 3 mm flat glass substrate with integrated in- and out-couplers, was used for the prototype development. The in- and out-couplers, photopolymer films with holographic fringes, induced total internal reflection in the glass substrate. Diffractive optical elements were integrated into the in-coupler to serve as an optical collimator. The waveguide captured images of the anterior segment of the eye right in front of it and guided the images to a processing unit distant from the eye. The vector connecting the pupil center (PC) and the corneal reflex (CR) of the eye was used to compute eye position in the socket. An eye model, made of a high quality prosthetic eye, was used prototype validation. The benchtop prototype demonstrated a linear relationship between the angular eye position and the PC/CR vector over a range of 60 horizontal degrees and 30 vertical degrees at a resolution of 0.64-0.69 degrees/pixel by simple pixel count. The uncertainties of the measurements at different angular positions were within 1.2 pixels, which indicated that the prototype exhibited a high level of repeatability. These results confirmed that the holographic waveguide technology could be a feasible platform for developing a wearable eye tracker. Further development can lead to a compact, see-through eye tracker, which allows continuous monitoring of eye movement during real life tasks, and thus benefits diagnosis of oculomotor disorders.

Citation Download Citation

Changgeng Liu, Beatrice Pazzucconi, Juan Liu, Lei Liu, and Xincheng Yao "A holographic waveguide based eye tracker", Proc. SPIE 10474, Ophthalmic Technologies XXVIII, 104741T (19 February 2018); https://doi.org/10.1117/12.2290065

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