A wearable lens with wireless sensors tracks intraocular pressure continuously, offering ultra-sensitive, non-invasive monitoring for early glaucoma detection and eye health management.
As the global population ages, glaucoma has become a growing concern, particularly in regions with high elderly populations. The chronic eye disease requires regular monitoring of intraocular pressure (IOP) to prevent irreversible vision loss. Existing IOP measurement tools are often bulky, non-portable, and unable to provide continuous monitoring, limiting their effectiveness for proactive ocular health management.
Researchers in Japan have developed an integrated smart contact lens that enables real-time monitoring of intraocular pressure, offering a promising solution for early glaucoma detection. The lens incorporates a PEDOT:PSS/PVA thin-film resistive sensor combined with a 70 MHz double-loop gold antenna, allowing continuous wireless measurement of IOP. By leveraging parity-time symmetry in the wireless system, the team enhanced the sensor’s sensitivity by a factor of 183 compared to conventional solutions, making it suitable for everyday, non-invasive use.
The device was tested in vitro on porcine eyes and in vivo on rabbit eyes, showing strong correlation with commercial tonometer readings. Its microfabricated design ensures user comfort while maintaining flexibility, making it a practical option for continuous ocular health monitoring.
Key features of the research include:
- PEDOT:PSS/PVA thin-film resistive sensor for precise IOP measurement
- 70 MHz double-loop gold antenna for continuous wireless monitoring
- Parity-time symmetry-based wireless system for ultra-high sensitivity
- Suitable for in vivo and in vitro IOP monitoring
- Compact, flexible design for user comfort
- Potential for long-term, non-invasive daily use
The development demonstrates how innovative use of thin-film materials and advanced wireless techniques can transform ocular health monitoring, enabling early detection and treatment of glaucoma while providing a comfortable, wearable solution for patients.
