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.
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 report a prototype 'smart' contact lens that measures eye pressure accurately, regardless of temperature.
About three million people in the U.S. have glaucoma, a group of diseases that damage the optic nerve and lead to vision loss, 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.
In laboratory tests, 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.
Glaucoma is a chronic condition that affects cells at the back of the eye. It is the leading cause of irreversible blindness worldwide. People with glaucoma, or at risk of developing glaucoma, ...
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