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'Smart' contact lenses could someday enable wireless glaucoma detection

'Smart' contact lenses could someday enable wireless glaucoma detection
This "smart" contact lens could someday help measure eye pressure and send wireless signals to enable early detection of glaucoma. Credit: Adapted from ACS Applied Materials & Interfaces (2024). DOI: 10.1021/acsami.4c02289

Most people with early-stage glaucoma don't know they have it, even though early treatment is key to reducing vision loss. While detecting a subtle increase in eye pressure helps doctors to diagnose glaucoma, it's challenging to monitor continuously, especially with the variety of temperatures eyes experience. Now, researchers in ACS Applied Materials & Interfaces report a prototype "smart" contact lens that measures eye pressure accurately, regardless of temperature.

About 3 million people in the U.S. have , a group of diseases that damage the and lead to , according to the Centers for Disease Control and Prevention. Doctors use flinch-inducing "air puff tests" during eye exams to take one-time measurements of eye pressure. A slight elevation in pressure, an otherwise imperceptible symptom caused by fluid buildup around the cornea, can lead to a glaucoma diagnosis.

Researchers have been testing ways to continuously and more comfortably detect these tiny fluctuations in pressure, such as contact lenses that transmit signals to receptor glasses. However, changing temperatures—like stepping outside into cold weather—can throw off the lenses' measurements. So, researcher Dengbao Xiao and colleagues wanted to develop a contact lens to accurately measure and wirelessly transmit real-time signals about across a wide range of temperatures.

'Smart' contact lenses could someday enable wireless glaucoma detection
Credit: ACS Applied Materials & Interfaces (2024). DOI: 10.1021/acsami.4c02289

First, Xiao and the team designed two miniature spiral circuits, each with a unique natural vibration pattern that would change when stretched by minute amounts, such as with changes to an eye's pressure and diameter. To create pressure-detecting contact lenses, the researchers sandwiched these tiny circuits between layers of polydimethylsiloxane, a typical contact lens material.

Then they wirelessly read the embedded circuits' vibration patterns by holding a coil near the lens that was connected to a computer. The transmitted signals were unaffected by tests meant to mimic eye movement, extended exposure to moisture (to simulate damp conditions in the eye), and daily wear and tear.

In , the researchers placed the new lenses on three individual pig eye specimens while controlling the ocular pressures and temperatures. The contact lenses monitored and wirelessly transmitted pressure data from 50 to 122 degrees F. When pressures were calculated from the signal of only one circuit in the lens, the results deviated up to 87% from the true values. However, when information from both circuits was used, the pressure readings differed by only 7% from the true value because the combination removed temperature-related errors.

The researchers say that their dual-circuit "smart" lens design has the potential to be used for accurate early detection and monitoring of glaucoma, even in a wide range of temperatures.

More information: Xu Li et al, Temperature Self-Compensating Intelligent Wireless Measuring Contact Lens for Quantitative Intraocular Pressure Monitoring, ACS Applied Materials & Interfaces (2024). DOI: 10.1021/acsami.4c02289

Citation: 'Smart' contact lenses could someday enable wireless glaucoma detection (2024, May 9) retrieved 23 June 2024 from
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