XPANCEO Unveils Passive Eye Tracking Smart Contact Lenses

XPANCEO, a deep-tech company specializing in smart contact lenses, announced the development of a passive eye-tracking system on April 8, 2026. The system is designed to achieve industry-level measurement precision using standard camera technology, removing the need for complex hardware embedded within the lens.

According to reporting from Bioengineer.org and News-Medical, the system operates without active electronic components or internal power sources. Instead, it utilizes the optical properties of the contact lens to serve as markers that can be detected by widely available imaging devices.

The Mechanism of Passive Tracking

The core of the technology involves the use of microscopic moiré patterns engineered into the surface of the contact lens. These patterns allow for the tracking of subtle eye movements with high accuracy by leveraging optical interference.

The system employs a sophisticated dual-layer nano-stripe pattern integrated into the lens surface. This assembly is subdivided into four discrete sections arranged side-by-side. Each section consists of two ultra-thin optical gratings separated by a minute microscopic gap.

As the wearer moves their eye, the angle of view relative to the camera changes. This change causes the two gratings to interact, producing shifting moiré interference patterns. These patterns are described as dynamic optical illusions created by the superposition of repetitive structures.

By analyzing the relative movement and deformation of these interference patterns, the system can decode the precise orientation and motion of the eye in a passive manner.

Materials and Design Specifications

To ensure the technology is suitable for ocular use, XPANCEO developed a biocompatible assembly. The nano-stripe patterns are encapsulated within a thin silicone elastomer, a material compatible with standard contact lens manufacturing processes.

The physical footprint of the tracking mechanism is designed to be unobtrusive. The assembly measures 2.5 by 2.5 millimeters, allowing it to fit within the lens without interfering with the wearer’s vision or comfort.

Impact on Wearable Technology

The introduction of this passive system represents a shift in how eye-tracking technology can be integrated into wearables. By eliminating the requirement for embedded batteries or circuitry, the technology reduces the complexity and potential risks associated with active electronics in the eye.

The ability to achieve industry-grade precision using only standard cameras suggests that high-accuracy eye tracking could be implemented using existing imaging hardware rather than requiring specialized, high-cost sensors.

• The system is entirely passive, requiring no embedded power source.
• It utilizes dual-layer nano-stripe patterns to create moiré interference.
• The biocompatible components are encapsulated in silicone elastomer.
• The tracking assembly occupies a space of 2.5 by 2.5 millimeters.
• Precision is achieved via standard camera technology.