acer 3d laptop without goggles. uses infrared eye tracking...arbitrary objects and framework? latency of the reflections from pupil to cornea enable the deduction of gaze direction. ======"Eye tracking is a fascinating technology that monitors and records eye movements to understand visual attention and behavior. Let me break it down for you:
How It Works:
Eye tracking employs infrared sensors or cameras to track eye positions and movements.
Near-infrared light is directed toward the center of the eyes (the pupil), creating detectable reflections in both the pupil and the cornea (the outermost optical element of the eye).
These reflections are tracked by an infrared camera, allowing precise measurement of the direction of gaze.
The relative difference in location between the pupil center and corneal reflection enables deduction of the gaze direction12.
Types of Eye Trackers:
Screen-Based Eye Trackers:
These devices require respondents to sit in front of a monitor and interact with screen-based content.
While they track eyes within certain limits (the “headbox”), respondents still have sufficient freedom of movement.
Useful for studying user behavior, usability, and cognitive processes during screen-based tasks.
Glasses-Based Eye Trackers:
These wearable devices integrate eye tracking into eyeglasses or head-mounted displays.
Ideal for studying real-world interactions, such as reading signs, navigating, or observing natural behavior1.
Now, let’s delve into how eye tracking contributes to the perception of 3D:
Depth Perception:
Our brain perceives depth through various cues:
Binocular Depth Cues: These cues arise from both eyes working together. They include:
Stereopsis: The slight disparity between the images received by each eye, which the brain combines to perceive depth.
Convergence: The inward movement of both eyes when focusing on a nearby object.
Monocular Depth Cues: These cues rely on information from one eye. Examples include:
Relative Size: Larger objects appear closer.
Overlap (Interposition): When one object partially covers another, the covered object is perceived as farther away.
Linear Perspective: Parallel lines converge as they recede into the distance.
Oculomotor Depth Cues: These cues involve eye movements and focus:
Accommodation: The eye’s lens adjusts its shape to focus on objects at different distances.
Convergence: As mentioned earlier, the inward movement of eyes provides depth information3.
Eye Tracking and 3D:
Eye tracking plays a crucial role in enhancing 3D experiences:
Trans-Saccadic Integration: When we scan our visual field with successive eye movements (saccades), our brain integrates high-resolution snapshots of the scene. This process contributes to our subjective experience of seeing the entire visual field in high acuity4.
In virtual reality (VR), eye tracking continuously measures the distance between the pupil center and the reflection of the cornea. By recording and tracking these movements, VR systems can optimize rendering, adjust focus, and enhance the sense of depth and realism5."
