Pourquoi les écrans LCD intégrés dans les lentilles de contact ont été abandonnés : des débuts visionnaires à l'échec commercial

The Dream Takes Shape: Early Concepts and Prototypes

Pioneering Proposals

The idea dates back to visionary inventors like Steve Mann, who sketched a bionic contact lens with an embedded display en 1999. These early ideas merged AR and miniature optics but remained conceptual due to technological constraints.

Google’s Smart Lens for Glucose Monitoring

In 2014, Google’s Verily unveiled a prototype sensory contact lens designed to measure glucose levels in tears with an embedded wireless chip and pinhole micro-sensor. Despite the innovation, the project was suspended in 2018, as tear glucose readings failed to correlate reliably with blood glucose.

Advanced R&D: CMST’s Electro-Optic Lens

Researchers led by De Smet in the 2010s developed thermoformed electro-optic layers inside a contact lens, including ultra-low power driver chips, micro-batteries, and hermetic protective coatings. This pioneering work demonstrated technical feasibility, albeit without full commercialization.

Breaking Ground: AR-Enabled Contact Lens Prototypes

Mojo Vision’s Ambitious Leap

Mojo Vision, founded in 2015, delivered perhaps the most advanced prototype: a microLED display avec 14,000 pixels per inch (PPI) just 0.5 mm in diameter, combined with motion sensors, eye tracking, a custom ASIC, and a wireless communication system. A CEO demo in 2022 showcased on-eye AR overlays such as compasses and teleprompters.

However, by 2023 Mojo Vision pivoted away from smart lenses and laid off 75% of staff, retaining only its microLED technology.

XPANCEO and Multi-Functional Lenses

More recently, XPANCEO (2025) secured $250 million funding to develop smart contact lenses offering AR, night vision, optical zoom, tear-based biomarker sensors, intraocular pressure monitoring, and wireless power transfer. These lenses aim for medical niches before possible consumer rollout in the 2030s.

Other Academic and Prototype Advances

• South Korean researchers demonstrated a glucose-alert LED lens, with tear fluid sensors triggering visual cues.
• Retina-embedded displays using conductive thin films advanced low-tech prototypes.
• Military research prototypes explored AR overlay lenses for soldiers.

The Technological Tightrope: Engineering Challenges

Miniaturization and Fabrication

Integrating a display, sensors, power source, radio, and driver IC into a tiny biocompatible lens demands ultra-precise microfabrication—thermoforming liquid-crystal cells, encapsulating circuitry against tear fluid, and ensuring oxygen permeability.

Power and Energy Constraints

Mini-batteries or wireless power via NFC may power prototypes briefly; yet continuous power remains a challenge, complicated by heat and safety concerns.

Biocompatibility and Comfort

Long-term wear demands biocompatible materials that allow tear exchange. Overwear risks irritation, infection, or corneal damage.

Visual UX and Optical Design

Fitting meaningful AR content into a narrow ~50° field of view while avoiding optic fatigue requires collimated retinas, minimal interface clutter, gaze-based input, and dynamic brightness compensation.

Health, Safety & Privacy

Soft contact lens misuse can cause serious health issues. Electronic implants that continuously record visual data raise huge privacy and surveillance risks.

Regulatory Barriers

As medical devices, smart lenses need FDA approval—requiring extensive clinical trials and long-term safety data.

Market Viability & Business Models

High manufacturing cost, unclear consumer demand, and speculative revenue models make business scaling difficult. Mojo Vision’s pivot and Verily’s discontinued project illustrate these economic limits.

The Market Retreat: Why the Concept Lost Momentum

We’ve seen pioneering projects reach working prototypes—but none have reached market viability, for several intertwined reasons:

• Technical Overreach – multiple engineering hurdles remain unsolved.
• High Costs – manufacturing is too expensive.
• Funding Constraints – R&D investors pulled back.
• Regulatory Complexity – lengthy approvals deter momentum.
• Consumer Reluctance – hesitation about putting electronics on the eye.
• Privacy & Ethics – invisible surveillance concerns.

Lessons Learned: Why the Market Turned Away

• Feasibility ≠ Demand. Just because prototypes existed didn’t mean mainstream consumers would embrace them.
• Safety First. The human eye is delicate; safe mass adoption demands near-perfect biocompatibility.
• Better Alternatives. AR glasses and smartphones remain more feasible.
• Focused Applications Win. Medical-use lenses like intraocular pressure sensors progress faster.

The Road Ahead: Will the Idea Ever Return?

While the widely embedded display lens failed to launch commercially, ongoing trends may revive parts of the concept:

• Medical Applications – XPANCEO’s biomarker and glaucoma monitoring lenses.
• Hybrid Designs – prescription lenses with passive AR optics.
• Wearables without Eyes – AR glasses as practical solutions.
• Component Technologies – Mojo Vision’s microLED benefiting other devices.
• Ethical Frameworks – regulation and trust needed for future adoption.

Conclusion

The journey of embedded LCD displays in contact lenses was an extraordinary technological dream—one that demanded breakthroughs in micro-electronics, optics, and human-machine interfaces.

While pioneers like Google, Mojo Vision, and XPANCEO made remarkable advances, multiple barriers—technical, health-related, economic, and ethical—ultimately sidelined mainstream adoption.

As technology evolves further, especially in medical and assistive contexts, hybrid or partial implementations may still succeed. But for now, smart contact lenses with embedded displays remain a vision of the future… not quite reality.