Wink-controlled polarization-switched telescopic contact lenses

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optics

Background:

• Telescopic vision aids are crucial for individuals with low vision.
• Current systems often require manual operation, limiting usability.
• Scleral contact lenses offer a stable platform for embedding optical components.

Purpose of the Study:

• To develop a hands-free, wink-controlled switching mechanism for eye-borne telescopic vision systems.
• To integrate magnification switching capabilities into scleral contact lenses.
• To enable seamless transitions between different visual paths using a novel control interface.

Main Methods:

• Orthogonal polarizers were integrated into scleral contact lenses for two vision paths (1× refractive and 2.8× catadioptric).
• Liquid crystal shutters were employed to control light passage through the polarizers.
• An infrared wink/blink monitor with passive retroreflectors in the lenses provided hands-free control.
• System functionality was validated using a life-size human eye model with mechanical eyelids.

Main Results:

• The system successfully demonstrated hands-free switching between 1× and 2.8× magnification.
• Wink-based control via the infrared monitor proved effective for managing the liquid crystal shutters.
• The integrated contact lenses and eyewear operated as a self-contained unit.

Conclusions:

• A novel wink-controlled, hands-free switching system for telescopic contact lenses has been successfully developed.
• This technology offers a promising advancement for assistive vision devices, enhancing user convenience and independence.
• Further research could explore real-world clinical applications and user performance.