Eye movements as a marker for visual prosthesis spatial mapping - A feasibility study using a blind patient implanted...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Ophthalmology

Background:

• Spatial mapping of perceived locations is crucial for visual prosthesis design.
• Current visual prosthesis systems often have electrode layouts misaligned with retinotopic maps.
• Accurate mapping is needed to correlate electrode stimulation with perceived locations in world coordinates.

Purpose of the Study:

• To demonstrate the feasibility of using eye movements as markers for spatial mapping of implanted electrodes.
• To reconstruct the spatial map of electrodes in a visual prosthesis user.
• To validate eye movement control in blind individuals with retinal implants.

Main Methods:

• A blind patient with an Argus II retinal prosthesis performed eye movements towards perceived locations generated by electrical stimulation.
• Analysis of eye movements triggered by electrical stimulation was used to map electrode percepts.
• World coordinates of electrode percepts were reconstructed based on recorded eye movements.

Main Results:

• Eye movements successfully served as markers to construct a spatial map of implanted electrodes.
• The spatial map of electrode percepts was reconstructed by analyzing triggered eye movements.
• The study confirmed that blind individuals retain eye movement control usable for mapping.

Conclusions:

• Eye movements provide a feasible method for mapping percept locations in patients with visual prostheses.
• This technique aids in understanding and improving the spatial representation in visual prosthetics.
• The findings highlight the potential of using residual motor control for functional rehabilitation in blindness.