June 2017
Volume 58, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2017
Novel eye-tracking method for retinal prostheses
Author Affiliations & Notes
  • Hiroyuki Kanda
    Applied Visual Science, Osaka Univ Graduate Sch of Med, Suita, Japan
  • Shunta Satonaka
    NIDEK CO., LTD., Gamagori, Japan
  • Takeshi Morimoto
    Applied Visual Science, Osaka Univ Graduate Sch of Med, Suita, Japan
  • Tomomitsu Miyoshi
    Integrative Physiology, Osaka Univ Graduate Sch of Med, Suita, Japan
  • Takashi Fujikado
    Applied Visual Science, Osaka Univ Graduate Sch of Med, Suita, Japan
  • Footnotes
    Commercial Relationships   Hiroyuki Kanda, NIDEK CO., LTD. (P); Shunta Satonaka, NIDEK CO., LTD. (E); Takeshi Morimoto, NIDEK CO., LTD. (P); Tomomitsu Miyoshi, None; Takashi Fujikado, NIDEK CO., LTD. (F)
  • Footnotes
    Support  JSPS KAKENHI Grant Number JP15K16353
Investigative Ophthalmology & Visual Science June 2017, Vol.58, 4188. doi:
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    • Get Citation

      Hiroyuki Kanda, Shunta Satonaka, Takeshi Morimoto, Tomomitsu Miyoshi, Takashi Fujikado; Novel eye-tracking method for retinal prostheses. Invest. Ophthalmol. Vis. Sci. 2017;58(8):4188.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Although a gaze feedback system is effective for retinal prostheses using an external camera (Hozumi et al ARVO 2016), there are issues of processing time and device weight in conventional eye-tracking devices. In this study, we propose a new eye-tracking method that estimates direction of gaze using stimulus artifacts generated by a retinal prosthesis. To confirm its feasibility, we evaluated the accuracy of the eye-tracking method using animal models.

Methods : In this study, a stimulating electrode was implanted into the scleral pocket created at the posterior pole of the eyes of anesthetized cats (n = 3). Stimulus pulses of 0.5 ms duration and 0.1–0.5 mA amplitude were applied to the eye via the stimulating electrode. A pair of recording electrodes was placed on the medial and lateral canthus of the implanted eye. Stimulus artifacts were evaluated by measuring the electrical potential difference between the recording electrodes. The recording trials were repeated 100 times. To measure gaze direction, we illuminated the eye and projected the fundus image on the screen placed 1.0 m in front of the eye. Changes in gaze direction were evaluated by measuring the shift in the fundus image on the screen. Finally, we investigated the relationship between the amount of shift in gaze direction and changes in the amplitude of stimulus artifacts.

Results : The amplitude of the stimulus artifact was significantly correlated with gaze direction in all animals (#1, r = 0.996 and p < 0.01; #2, r = 0.970 and p < 0.01; #3, r = 0.997 and p < 0.01; Pearson correlation analysis). Standard deviations of the residual error of linear regression were 0.1, 0.5, and 0.2 degrees in #1, #2, and #3, respectively.

Conclusions : These findings demonstrate that gaze direction can be estimated using stimulus artifacts evoked by retinal prosthesis without delay of processing time.

This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.

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