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Sadeghi R, Kartha A, Barry MP, Gibson P, Caspi A, Roy A, Geruschat DR, Dagnelie G. Benefits of thermal and distance-filtered imaging for wayfinding with prosthetic vision. Sci Rep 2024; 14:1313. [PMID: 38225344 PMCID: PMC10789760 DOI: 10.1038/s41598-024-51798-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 01/09/2024] [Indexed: 01/17/2024] Open
Abstract
Visual prostheses such as the Argus II provide partial vision for individuals with limited or no light perception. However, their effectiveness in daily life situations is limited by scene complexity and variability. We investigated whether additional image processing techniques could improve mobility performance in everyday indoor environments. A mobile system connected to the Argus II provided thermal or distance-filtered video stimulation. Four participants used the thermal camera to locate a person and the distance filter to navigate a hallway with obstacles. The thermal camera allowed for finding a target person in 99% of trials, while unfiltered video led to confusion with other objects and a success rate of only 55% ([Formula: see text]). Similarly, the distance filter enabled participants to detect and avoid 88% of obstacles by removing background clutter, whereas unfiltered video resulted in a detection rate of only 10% ([Formula: see text]). For any given elapsed time, the success rate with filtered video was higher than with unfiltered video. After 90 s, participants' success rate reached above 50% with filtered video and 24% and 3% with normal camera in the first and second tasks, respectively. Despite individual variations, all participants showed significant improvement when using the thermal and distance filters compared to unfiltered video. Adding a thermal and distance filter to a visual prosthesis system can enhance the performance of mobility activities by removing clutter in the background, showing people and warm objects with the thermal camera, or nearby obstacles with the distance filter.
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Affiliation(s)
- Roksana Sadeghi
- Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA.
- Herbert Wertheim School of Optometry and Vision Science, University of California, Berkeley, CA, USA.
| | - Arathy Kartha
- Department of Biological and Vision Sciences, State University of New York College of Optometry, New York, NY, USA
- Department of Ophthalmology, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Michael P Barry
- Department of Ophthalmology, Johns Hopkins School of Medicine, Baltimore, MD, USA
- Pritzker Institute for Biomedical Science and Engineering, Illinois Institute of Technology, Chicago, IL, USA
| | - Paul Gibson
- Advanced Medical Electronics Corporation, Maple Grove, MN, USA
| | - Avi Caspi
- Jerusalem College of Technology, Jerusalem, Israel
| | | | - Duane R Geruschat
- Department of Ophthalmology, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Gislin Dagnelie
- Department of Ophthalmology, Johns Hopkins School of Medicine, Baltimore, MD, USA
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Markowitz M, Rankin M, Mongy M, Patino BE, Manusow J, Devenyi RG, Markowitz SN. Rehabilitation of lost functional vision with the Argus II retinal prosthesis. Can J Ophthalmol 2018; 53:14-22. [PMID: 29426432 DOI: 10.1016/j.jcjo.2017.12.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 11/28/2017] [Accepted: 12/05/2017] [Indexed: 10/18/2022]
Abstract
The Argus II retinal prosthesis is the first commercially available device for restoration of vision in patients with Retinitis Pigmentosa or with similar retinal pathology who still have minimal residual native vision. The technology is able to restore vision with production of artificial visual percepts which usually are given adequate useful interpretation by the visual system in most implanted patients. The technology usually produces visual perception at the level of shape identification or better in some cases enabling in many less dependence on vision substitution devices and skills. There is no consensus among vision rehabilitation practitioners on single methods for assessments, outcome measures and training, yet there is constant progress in these areas of concern. Hence the current vision rehabilitation practice related to the implantation of the Argus II retinal prosthesis is a work in progress with many learning opportunities for all involved. All agree that implementation of this technology in clinical practice requires the combined work of a multi-disciplinary team which includes a specialized surgical team as well as a specialized rehabilitation team in order to obtain optimal results. Our own experience is presented in this paper and indicates so far that the Argus II technology is beneficial to patients and that it could be successfully managed within the Canadian heath care system.
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Affiliation(s)
| | - Mark Rankin
- Vision Loss Rehabilitation Ontario, CNIB, Toronto, Ont
| | - Mohamed Mongy
- Low Vision Service (University Health Network Hospitals), Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Toronto, Ont
| | - Beatrice E Patino
- Low Vision Service (University Health Network Hospitals), Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Toronto, Ont
| | - Joshua Manusow
- Low Vision Service (University Health Network Hospitals), Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Toronto, Ont
| | - Robert G Devenyi
- Low Vision Service (University Health Network Hospitals), Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Toronto, Ont
| | - Samuel N Markowitz
- Low Vision Service (University Health Network Hospitals), Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Toronto, Ont.
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Geruschat DR, Rankin M, Dorn JD. An Introduction to Providing Rehabilitation to Individuals who Have Been Implanted with the Argus II Retinal Prosthesis System. JOURNAL OF VISUAL IMPAIRMENT & BLINDNESS 2017. [DOI: 10.1177/0145482x1711100611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Duane R. Geruschat
- Wilmer Eye Institute, Johns Hopkins University, 101 Edgewater Road, Severna Park, MD 21146
| | - Mark Rankin
- Vision Loss Rehabilitation Ontario, 1929 Bayview Avenue, Toronto, ON M4G 3E8, Canada
| | - Jessy D. Dorn
- Second Sight Medical Products, 12744 San Fernando Road, Building 3, Sylmar, CA 91342
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