Researchers have made a significant stride in eye health, unveiling contact lenses armed with embedded sensors designed to gauge the pressure inside the eye. These lenses not only measure intraocular pressure (IOP) but also transmit this crucial information to an ophthalmologist for careful evaluation. The primary aim is to facilitate early detection of glaucoma, a condition that, if left untreated, can result in irreversible vision loss.
Glaucoma emerges when increased intraocular pressure damages the optic nerve, the vital link between the eye and the brain. This elevated pressure often arises from a fluid buildup in the eye's front part. What makes glaucoma particularly insidious is its gradual progression, earning it the moniker 'silent thief of sight.' By the time routine eye tests uncover glaucoma, irreversible damage may have already occurred.
The groundbreaking GlakoLens features an electrically passive sensor embedded in a disposable soft contact lens made of polydimethylsiloxane (PDMS). A wearable electronic readout system wirelessly collects, stores, and processes the data collected by the lens. Subsequently, the processed data is handed over to an ophthalmologist for thorough evaluation.
A key advantage of the GlakoLens lies in its ability to facilitate more straightforward and extended intraocular pressure measurements compared to traditional eye exams. This prolonged monitoring period enhances the accuracy of diagnoses.
Hamdi Torun, the corresponding expert in the study, highlights the necessity of continuous or interval-based monitoring over a 24-hour period. Traditional methods often involve a single measurement in a day at a clinic, which may lead to misleading results due to the natural variation of intraocular pressure. Subsequent investigations may require a full day of hospitalization, involving repeated measurements using techniques like Goldmann applanation tonometry (GAT).
The GlakoLens, in contrast, offers a less invasive experience. Once placed in the eye, patients can go about their day as usual while their intraocular pressure measurements are recorded. This data is then sent to a doctor for analysis after the 24-hour testing period concludes.
In a trial involving six healthy volunteers, the contact lenses responded effectively to intentional increases in intraocular pressure caused by water intake. The findings, coupled with measurements from the lens-less right eye for comparison, underscore the potential of GlakoLens in practical scenarios.
Future experiments with larger cohorts aim to delve into the sensor's accuracy and reliability. The researchers also express their commitment to refining the comfort and non-invasiveness of these contact lenses in subsequent iterations.
While GlakoLens isn't the first attempt at developing glaucoma-detecting contact lenses, it stands out for prioritizing wearer comfort. Unlike previous lenses employing an electrically active silicon chip, resulting in thicker and less flexible lenses, GlakoLens ensures wearer comfort through its electrically passive sensor and soft contact lens design.
Looking ahead, the researchers envision broader applications for their lenses, suggesting the potential to detect various health conditions by measuring substances like glucose and lactic acid in the eye.
In the words of Torun, "We believe this technology has huge potential and could not only save the sight of patients in the early stages of glaucoma but also provide early diagnosis of other diseases in the future." The trajectory of eye health seems promising with innovations like GlakoLens on the horizon.
MEDICAL
GLAUCOMA
CONTACT LENSES
SENSORS
WEARABLE
NORTHUMBRIA UNIVERSITY