The most common eye-tracking technologies used in augmented reality (AR) glasses include:

1. Camera-Based Tracking

• Description: Utilizes small cameras mounted on the AR glasses to capture images of the user's eyes.
• How It Works: Algorithms process these images to determine gaze direction, fixation points, and pupil movement.
• Common Use: Widely used for both remote and wearable eye trackers in AR applications.

2. Infrared (IR) Illumination

• Description: It uses infrared light to illuminate the eye, making it easier to detect pupil position and corneal reflection.
• How It Works: The IR light creates a reflection on the cornea, allowing the system to calculate gaze direction based on the position of the pupil relative to this reflection.
• Advantages: Effective in various lighting conditions and provides high accuracy.

3. Electrooculography (EOG)

• Description: Measures the electrical potential difference between the front and back of the eye.
• How It Works: Electrodes placed around the eyes detect changes in electrical signals as the eyes move.
• Use Case: Often used in medical applications or situations where traditional optical methods may be challenging.

4. Optical Tracking Systems

• Description: It combines multiple cameras and sensors to triangulate eye position more accurately.
• How It Works: It uses a combination of gaze tracking and advanced algorithms to enhance precision and reduce drift.
• Benefits: It provides robust tracking capabilities, especially in dynamic environments.

5. Machine Learning Algorithms

• Description: It employs AI and machine learning to improve eye-tracking accuracy and predictive capabilities.
• How It Works: It analyzes patterns in gaze data to predict user intent and enhance interaction.
• Applications: Used to optimize user experiences by adapting content based on gaze behavior.

6. Hybrid Systems

• Description: It combines multiple tracking technologies (e.g., camera-based and EOG) to increase robustness and accuracy.
• Advantages: Offers better performance across different environments and user conditions.

Conclusion

These eye-tracking technologies enable AR glasses to provide intuitive interactions and personalized experiences. As AR technology continues to evolve, advancements in eye-tracking methods will likely enhance the capabilities and usability of AR applications.