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Updated: Aug 29, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Add-on optical mask to declutter visual information based on depth for visual prostheses.

Benny Milgrom, Avi Caspi

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |September 10, 2022
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    Summary
    This summary is machine-generated.

    This study introduces a novel optical mask for RGB cameras, enabling passive depth sensing for visual prostheses. This technology enhances scene perception by providing distance information, crucial for navigation and safety.

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    Area of Science:

    • Biomedical Engineering
    • Computer Vision
    • Optical Physics

    Background:

    • Visual prostheses often struggle with scene information decluttering, leading to perception issues where bright, distant objects obscure nearby obstacles.
    • Current depth sensing methods like Lidar and stereo imaging are unsuitable for wearable visual prostheses due to power or computational demands.

    Purpose of the Study:

    • To develop a simple, passive, and robust depth sensor for visual prostheses.
    • To enhance the delivery of relevant visual information to implants by incorporating distance data.

    Main Methods:

    • An optical mask was designed and fabricated to induce chromatic aberrations and wavelength-dependent focal plane shifts.
    • When placed in front of an RGB camera, the mask causes different colors (red, green, blue) to focus at distinct distances (near, mid, far).
    • A standard deviation image filter was employed to extract in-focus information and convert color data into depth information.

    Main Results:

    • The optical mask successfully enabled depth perception by separating focal planes based on color wavelengths.
    • Red, green, and blue channels focused on near, mid, and distant objects, respectively.
    • The system effectively converted color-coded depth information into a usable format.

    Conclusions:

    • The proposed optical mask provides a viable solution for passive depth sensing in visual prostheses.
    • This technology can significantly improve the functionality and usability of visual prostheses, particularly in outdoor environments.
    • The miniature, passive nature of the device makes it suitable for integration into wearable visual aid systems.