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Related Experiment Videos

Artificial vision

M S Humayun1, E de Juan

  • 1Wilmer Ophthalmological Institute, Johns Hopkins Hospital, Baltimore, MD 21287, USA. mhumayan@gwgate1.jhmi.jhu.edu

Eye (London, England)
|October 17, 1998
PubMed
Summary
This summary is machine-generated.

Electrical stimulation of retinal neurons can restore a form of vision in patients with retinitis pigmentosa (RP) and age-related macular degeneration (AMD). This technique successfully generated light perceptions (phosphenes) in all subjects, offering potential for mobility vision.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Outer retinal degenerations, including retinitis pigmentosa (RP) and age-related macular degeneration (AMD), cause blindness due to photoreceptor cell loss.
  • Current treatments for RP and AMD are limited, necessitating novel approaches to restore vision.

Purpose of the Study:

  • To investigate the potential of controlled electrical stimulation of inner retinal neurons to restore form vision in patients with RP and AMD.
  • To assess the feasibility and efficacy of micro-electrode implantation for retinal stimulation.

Main Methods:

  • Electrically stimulated the inner retinal surface using micro-electrodes inserted through the sclera in 14 patients (12 RP, 2 AMD) under local anesthesia.
  • Recorded patient responses via a surgical microscope-mounted video camera.

Related Experiment Videos

  • Assessed phosphene perception and retinotopic accuracy, and conducted a resolution test for visual acuity.

    • Main Results:

    • All subjects perceived a spot of light (phosphene) upon electrical stimulation of the inner retina.
    • Retinotopic correspondence of phosphenes was observed in 13 out of 14 patients.
    • One patient with no light perception could resolve phosphenes with a center-to-center distance of 1.75 degrees, indicating potential for mobility vision.

    Conclusions:

    • Controlled electrical stimulation of the inner retina is a viable strategy to elicit visual percepts in patients with outer retinal degenerations.
    • This approach shows promise for restoring a degree of functional vision, potentially improving mobility and quality of life for individuals with RP and AMD.