An observational study in Retinitis Pigmentosa, sponsored by Second Sight Medical Products. Completed at 3 sites in France. Open to participants aged 25 Years and older. Per ClinicalTrials.gov, last updated 2020-06-22.
Sponsored by Second Sight Medical Products · Observational
This is a post-market study of the Argus II Retinal Prosthesis System. The study is being conducted in France. The objective of the study is to obtain data to further demonstrate the effectiveness and evaluate the safety of Argus II System in patients with retinitis pigmentosa who have a bare light perception or worse in both eyes.
This study is a controlled, prospective, multi-centre, single-arm post-market study. All data collected will be obtained from procedures that are performed as part of routine patient case and from non-interventional questionnaires.
Control will consist of three different matched comparisons:
Subjects participating in the study will undergo a Baseline Visit. The Baseline Visit is performed to screen the subject for eligibility for the device and to collect the study baseline assessments. Assessments include a complete eye examination and medical evaluation, retinal photography and Optical Coherence Tomography, Ultrasound A- and B-scans, the photographic flash test, visual acuity tests, the FLORA and a psychosocial evaluation in order to ensure that the subject has realistic expectations about the system. The NEI-VFQ-25 questionnaire will also be administered.
Subjects who are enrolled in the study will undergo a surgery to have the Argus II device implanted. Following implantation surgery, subjects will return to the clinic for periodic clinical follow-up and device fitting. They will also receive training and visual rehabilitation.
Clinical follow-up visits will take place 1 and 2 weeks, 1, 3, 6, 12 and 24 months post-implant. Examinations and tests will be performed as at baseline. In addition, a patient satisfaction, Ease of Use, and Utilization of the System Questionnaire will be administered. Most of the visual function tests and measures will be conducted in both the implanted and fellow eye to provide data on the natural course of the participants' vision loss and as a control for measurements of visual function. In addition, the visual function tests and the FLORA will be done for the implanted eye with the device ON as well as OFF.
Device Fitting refers to the procedure for customizing the Video Processing Unit (VPU) for use by the subject. Device Fitting is typically begins one week post-implant and is completed in approximately 4 sessions.
Beginning approximately one month post-implant, subjects will receive training on how to use the Argus II System. There are two phases of training: system training and visual rehabilitation. During system training, subjects learn basic skills: how to connect the glasses to the VPU, change battery etc., how to control eye movements and RF link, how to scan the environment with head movements and how to use different filters and switch between program settings. During visual rehabilitation, subjects learn how to integrate the use of the Argus II System into their everyday life. Visual rehabilitation sessions will be provided by certified low-vision therapists and/or orientation and mobility specialists and will take place both at the clinic and the subject's home.
250 studies on the registry are indexed under Retinitis; 28 are open to participants now.
This study's enrollment of 18 is below the median of 60 across 64 observational studies indexed under Retinitis.
Browse Retinitis studies →Second Sight Medical Products is the lead sponsor of 9 studies on the registry; none are open to participants now.
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Patients with retinitis pigmentosa who have bare light perception or worse in both eyes
Exclusion Criteria:
Any disease or condition that prevents understanding or communication of informed consent, study demands, and testing protocols, including:
Ocular diseases or conditions that could prevent Argus II from working (e.g. optic nerve disease, central retinal artery or vein occlusion, history of retinal detachment, trauma, severe strabismus, etc.);
Any disease or condition that prevents understanding or communication of informed consent, study demands, and testing protocols, including:
The Argus II System is designed to provide visual function to individuals with severe to profound vision loss due to outer retinal degeneration. It consists of implanted and external components. The implant is an epiretinal prosthesis that is surgically implanted in and around the eye. The external equipment includes glasses and a video processing unit (VPU). The glasses include a miniature video camera, which captures video images, and a coil that sends data and stimulation commands to the implant. The VPU converts the video images into stimulation commands and is body-worn. The Argus II System operates by converting video images into electrical energy that activates retinal cells, delivering the signal through the optic nerve to the brain where it is perceived as light.
Functional Vision - FLORA
The impact of the Argus II on subjects' lives (in terms of functional vision and quality of life) as measured by the Functional Low-vision Observer Rated Assessment (FLORA)
Time frame: 2 Years
Adverse events
Incidence of procedure- and device-related adverse events
Time frame: 2 Years
Patient Satisfaction and ease of use of the System
A questionnaire will be administered to track how satisfied or dissatisfied subjects are with the Argus II System, how frequently they use the system, how easy or difficult they think the system is to use, and the ways in which they use the System outside the clinic.
Time frame: 2 years
Visual Function
Visual function will be assessed using the following tests: * Square Localization: This test assesses subject's light projection. * Direction of Motion: This test indicates a subject's ability to detect the direction of a moving object. * Grating Visual Acuity: This test is designed to determine a subject's visual acuity using the principles of acuity charts such as ETDRS, modified for extremely low vision. It measures visual acuity between 1.6 to 2.9 logMAR. Subjects' performance on the 3 tests above will be compared: o Pre-vs. post-implant and. With the Argus II System ON vs. OFF
Time frame: 2 years
Functional Vision
The National Eye Institute Visual Function Questionnaire (VFQ-25) will be administered to obtain subjects' self-reported assessment of their vision and what tasks they can perform with their vision (i.e. vision-targeted health status).
Time frame: 2 years
Explantation rate
Measure device reliability through explantation rates
Time frame: 2 years
This study is completed, as verified in Jun 2020. You cannot join it, but the record below documents what was studied.
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