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Related Experiment Video

Updated: Jul 1, 2025

Development of an In Vitro Ocular Platform to Test Contact Lenses
08:28

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Published on: April 6, 2016

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Power Scavenging Microsystem for Smart Contact Lenses.

Erfan Pourshaban1, Mohit U Karkhanis1, Adwait Deshpande1

  • 1Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT, 84112, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|March 13, 2024
PubMed
Summary

Researchers developed a novel hybrid power system for on-the-eye microsystems. This system combines a flexible solar cell and an eye-blinking energy harvester to sustainably power smart contact lenses without external accessories.

Keywords:
eye‐blinkingmetal–air batteriespower packsmart contact lensessolar cells

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Energy Harvesting

Background:

  • On-the-eye microsystems, or smart contact lenses, offer advanced functionalities like vision correction and health monitoring.
  • Powering these low-profile devices on the curved surface of the eye presents a significant technical challenge.
  • Existing power solutions often rely on external accessories or wireless power transfer, which can be inconvenient.

Purpose of the Study:

  • To design and fabricate a self-sustaining, low-profile hybrid power source for ocular microsystems.
  • To address the challenge of powering flexible electronics integrated onto the ocular surface.
  • To develop a power solution that does not require external accessories for continuous operation.

Main Methods:

  • Fabrication of a hybrid energy unit integrating a flexible silicon solar cell and a magnesium-oxygen (Mg-O2) metal-air energy harvester activated by eye blinking.
  • Characterization of the power output from both the photovoltaic and the blinking-activated components under various conditions.
  • Integration of a power management circuit with a supercapacitor to stabilize and boost the harvested energy for continuous power delivery.

Main Results:

  • The flexible solar cell achieved power densities of 42.4 µW/cm² (indoor) and 2.5 mW/cm² (outdoor).
  • The eye-blinking Mg-air harvester demonstrated a maximum power density of 1.3 mW/cm².
  • The integrated power management system successfully delivered a continuous ≈150 µW at 3.3 V DC.

Conclusions:

  • A novel hybrid power system capable of continuously generating electrical power for smart ocular devices has been successfully developed.
  • This power pack offers a self-sufficient and integrated solution, eliminating the need for external power accessories.
  • The developed technology paves the way for advanced, untethered on-the-eye microsystems for diverse applications.