A 'smart' contact lens with a built-in sensor could help determine which glaucoma patients are at a higher risk of progression. Glaucoma remains a leading cause of blindness. Researchers from Columbia University Medical Centre in US found certain patterns of electrical signals emitted from the contact lenses correlate with a faster rate of glaucoma progression. Similar to how an electrocardiogram shows a heartbeat, the profile of signals from the smart lens indirectly shows eye pressure changes over time. One of the main indicators of the disease is high pressure in the eye. Doctors often check eye pressure to gauge a patient's eye health. Using these findings, clinicians can better estimate the risk of progression by looking at a readout from the smart lens.