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Silicon Retina
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Transcript

  • 1. SILICON RETINA USING VLSI TECHNOLOGY
  • 2.  Working of eye.  Retinal Cells.  Retinal diseases.  Macular degeneration.  Retinitis Pigmentosa.  Artificial Silicon Retina.  Implantation Surgery.  Working of ASR device  Role of ASR in tracking objects.  Other applications.  Conclusion.
  • 3. EYE How our retina works ?
  • 4.  Rods  Cones  Ganglion Cells
  • 5. Age-related Macular Degeneration(AMD) Retinitis Pigmentosa(RP)
  • 6.  Primarily affects the highest resolution central portion of the retina known as the macula.
  • 7.  Patients have severe narrowing of their visual fields down to a very small central circle, and all patients suffering with it are legally blind.
  • 8.  ASR designed to stimulate damaged retinal cells from within the retina to allow the cells to recreate visual signals that are processed and sent to the brain.  The ASR microchip is a silicon chip 2 mm in diameter, 25 microns in thickness.  IT contains approximately 5,000 microscopic solar cells called “micro photodiodes,” each with its own stimulating electrode.
  • 9. INCISION VACCUMING AND FILLING SUBRETINAL SPACE
  • 10.  The ASR's photoelectric signals can induce artificial biological visual signals in the remaining functional retinal cells.  These signals are processed and sent to the brain through the optic nerve .
  • 11.  The top image shows the raw output of the retina chip, the middle one a picture processed from it and the third shows how moving face would appear.  The silicon retina provides information about the edges of images rather than a whole picture. Edge information is usually sufficient for detecting and tracking objects.
  • 12.  Walking Robots  Smart Sensors(Remote monitoring devices)
  • 13. No significant safety-related adverse effects were observed. Retinal visual improvements. A larger clinical trial is indicated to further evaluate the safety and efficacy of a sub-retinally implanted ASR.