Eye movement control in the Argus II retinal-prosthesis enables reduced head movement and better localization precision
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Purpose: Visual scanning by sighted individuals is done using eye and head movements. In contrast, scanning using the Argus II is solely done by head movement, since eye movements can introduce localization errors. Here, we tested if a scanning mode utilizing eye movements increases visual stability and reduces head movements in Argus II users. Methods: Eye positions were measured in real-time and were used to shift the region of interest (ROI) that is sent to the implant within the wide field of view (FOV) of the scene camera. Participants were able to use combined eye-head scanning: shifting the camera by moving their head and shifting the ROI within the FOV by eye movement. Eight blind individuals implanted with the Argus II retinal prosthesis participated in the study. A white target appeared on a touchscreen monitor and the participants were instructed to report the location of the target by touching the monitor. We compared the spread of the responses, the time to complete the task, and the amount of head movements between combined eye-head and head-only scanning. Results: All participants benefited from the combined eye-head scanning mode. Better precision (i.e., narrower spread of the perceived location) was observed in six out of eight participants. Seven of eight participants were able to adopt a scanning strategy that enabled them to perform the task with significantly less head movement. Conclusions: Integrating an eye tracker into the Argus II is feasible, reduces head movements in a seated localization task, and improves pointing precision.
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In prostheses with a head-mounted camera, misalignment between the camera orientation and the pupillary axes can induce localization problems.
“Therefore, in prostheses with a head-mounted camera, misalignment between the camera orientation and the pupillary axes can induce localization problems (Caspi et al., 2018; Paraskevoudi and Pezaris, 2018; Sabbah et al., 2014; Schmidt et al., 1996).”
From Towards biologically plausible phosphene simulation for the differentiable optimization of visual cortical prostheses (2024) · cites this paper as Caspi et al., 2018
Preliminary evidence suggests that gaze-contingent image processing can improve the functional and subjective quality of prosthetic vision.
“While further research is required, there is some preliminary evidence that such a gaze-contingent image processing can improve the functional and subjective quality of prosthetic vision (Caspi et al., 2018; Paraskevoudi and Pezaris, 2021; Rassia and Pezaris, 2018; Titchener et al., 2018).”
From Towards biologically plausible phosphene simulation for the differentiable optimization of visual cortical prostheses (2024) · cites this paper as Caspi et al., 2018
Previously, the ability to perform artificial vision scanning using eye movements could be restored in retinal-prosthesis users.
“Previously, we demonstrated that the ability to perform artificial vision scanning using eye movements could be restored in retinal-prosthesis users.”
From Eye movements and the perceived location of phosphenes generated by intracranial primary visual cortex stimulation in the blind (2021) · cites this paper as [35]
Head movements shifted the entire field-of-view of the head-mounted camera and eye movements shifted the region of interest within the wide field-of-view of the camera.
“Head movements shifted the entire field-of-view of the head-mounted camera and eye movements shifted the region of interest within the wide field-of-view of the camera.”
From Eye movements and the perceived location of phosphenes generated by intracranial primary visual cortex stimulation in the blind (2021) · cites this paper as [35]
Subjects were able to use a combined eye-head scanning mode.
“Subjects were able to use a combined eye-head scanning mode [35].”
From Eye movements and the perceived location of phosphenes generated by intracranial primary visual cortex stimulation in the blind (2021) · cites this paper as [35]
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BackgroundResultCaspi, A., Barry, M. P., Patel, U. K., Salas, M. A., Dorn, J. D., Roy, A., Niketeghad, S., Greenberg, R. J., & Pouratian, N. (2021) · Brain Stimulation · doi:10.1016/j.brs.2021.04.019 · Cited by 32 · see citing works
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Self-citationde Ruyter van Steveninck, J., Nipshagen, M., van Gerven, M., Güçlü, U., Güçlüturk, Y., & van Wezel, R. (2024) · Journal of Neural Engineering · doi:10.1088/1741-2552/ad357d · Cited by 8 · see citing works
- Authors
- Caspi, A., Roy, A., Wuyyuru, V., Rosendall, P. E., Harper, J. W., Katyal, K. D., Barry, M. P., Dagnelie, G., & Greenberg, R. J.
- Affiliations
- Jerusalem College of Technology (IL)
- Second Sight Medical Products (US)
- Johns Hopkins University Applied Physics Laboratory (US)
- Johns Hopkins University (US)
- Corresponding author
- Caspi, Avi
- Venue
- Investigative Opthalmology & Visual Science
- Published
- 2018-02-01
- Volume
- 59
- Issue
- 2
- Pages
- 792
- ISSN
- 0146-0404 (ISSN-L)
- 1552-5783
- OpenAlex
- W2787566947
- Cited by
- 47
- References
- 31
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 3 · 2023: 6 · 2022: 4 · 2021: 5 · 2020: 8 · 2019: 7 · 2018: 4
- FWCI
- 2.73
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Investigative Ophthalmology & Visual Science (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neural Engineering
- Physical Sciences › Computer Science › Human-Computer Interaction › Gaze Tracking and Assistive Technology
- Life Sciences › Neuroscience › Cognitive Neuroscience › Tactile and Sensory Interactions
- Keywords
- Argus II retinal prosthesis, oculomotor control, localization precision, eye tracking, blind users, visual exploration, visual stability
- MeSH terms
- Aged, Blindness, Eye Movements, Female, Humans, Male, Middle Aged, Psychomotor Performance, Retinitis Pigmentosa, Visual Acuity, Head Movements, Persons with Visual Disabilities, Visual Prosthesis
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