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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...

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Customizing a Cryolite Glass Prosthetic Eye
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A 'living' prosthetic iris.

J Lapointe1, J-F Durette, A Harhira

  • 1Department of Engineering Physics, Advanced Photonics Concepts Laboratory, Ecole Polytechnique de Montreal, Montreal, Quebec, Canada. jerome-2.lapointe@polymtl.ca

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|September 18, 2010
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Summary
This summary is machine-generated.

Researchers developed a dynamic pupil for ocular prostheses that reacts to light, improving realism. This autonomous, self-powered device uses a liquid crystal display (LCD) and passive electronics for enhanced patient quality of life.

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Area of Science:

  • Biomedical Engineering
  • Ophthalmology
  • Materials Science

Background:

  • Ocular prostheses currently lack dynamic pupil functionality, limiting their realism.
  • The immobility of artificial pupils in ocular prostheses is a significant drawback.

Purpose of the Study:

  • To design and demonstrate a dynamic pupil for ocular prostheses that mimics natural light response.
  • To enhance the realism and functionality of ocular prostheses through light-reactive pupil technology.

Main Methods:

  • Fabrication and testing of liquid crystal display (LCD) cells for survivability in ocular prosthesis manufacturing.
  • Development of a novel, autonomous, self-powered passive electronic circuit using a solar cell to control pupil size.
  • Integration of the dynamic pupil mechanism within a proposed ocular prosthesis design.

Main Results:

  • Demonstration of the first LCD capable of withstanding ocular prosthesis manufacturing processes.
  • Successful implementation of an entirely passive electronic circuit for autonomous pupil control.
  • Presentation of a design for a complete ocular prosthesis featuring a dynamic pupil and a standard device for mass production.

Conclusions:

  • A practical, autonomous, self-powered dynamic pupil solution is feasible within manufacturing constraints (size, weight, cost, manufacturability).
  • Mass production of LCDs for dynamic pupils is envisioned, with patient-specific iris matching in final assembly stages.
  • Clinical trials are planned to validate the positive impact of dynamic pupils on patient quality of life.