Pressure-Sensing Contact Lenses Monitor Glaucoma

Pressure-sensing contact lenses developed by University of California researchers have an embedded pressure sensor. This could lead to glaucoma-sensing contact lenses able to continuously monitor the eye.


(Pressure-sensing contact lenses for glaucoma with pattern of conductive silver wires)

Tingrui Pan, assistant professor of biomedical engineering, and postdoctoral researcher Hailin Cong started with a material called polydimethylsiloxane (PDMS). They developed a method for placing powdered silver on the PDMS in a precise pattern, to create conductive wires. The silver also has antimicrobial properties.

The researchers were able to shape the PDMS-silver into a contact-lens shape, and show that it could function as a simple pressure sensor. Glaucoma, a build-up of pressure in the eye, is a leading cause of blindness worldwide. A contact lens that could continuously measure pressure within the eye and relay the data to a computer would allow doctors to learn more about glaucoma and improve patient treatment.

The researchers plan to apply for approval to begin trials of the lenses in humans, Pan said. They are collaborating with Professor James Brandt of the Department of Ophthalmology at the UC Davis School of Medicine.

In their 1992 story The California Voodoo Game, Larry Niven and Steven Barnes wrote about scleral contact lenses with embedded circuitry.

In a 2001 story, Fast Times at Fairmont High, Vernor Vinge wrote about smart contact lenses with embedded circuitry. This field is progressing in real life; see Circuit Smart Contact Lens, Presaged by Niven, Barnes and Vinge.

From Smart Contact Lenses via MedGadget

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