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Terminology

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Yes, we know. Eye tracking terms does include many new terms. This page outlines some of the most common ones being used.

Eye Tracking

Gaze Point

The estimated point of the user's gaze in areal life coordinate space. For example (0,0) in the bottom corner of a screen. This estimation usually requires a calibration procedure prior to use.

Dwell time

How long a user fixates on a point of regard.

Visual axis

The line created by extending an imaginary line through the center of the pupil, around which there is rotational symmetry.

Trackbox

A virtual box that the user has to stay within in order to get tracked correctly. Usually the user will be placed orthorgonal to the camera axis, and have the face oriented towards the screen.

Accuracy vs Precision

Accuracy vs. Precision is a quite important distinction in eye tracking. Eye%20tracking%20terms/Accurary_vs._precision.png

Eye Movements

Fixation

The ability to steadily and accurately gaze at an object of regard. This is most dysfunctional in nystagmus which is an uncontrollable shaking of the eyes.

Pursuits

The ability to smoothly and accurately track, or follow, a moving object.

Saccades

The ability to quickly and accurately look, or scan, from one object to another.

Vergence

The ability to accurately aim the eyes at an object of regard and to track an object as it moves towards and away from the person.

Binocularity

The integration of accommodation and convergence.

Accommodation

*The ability to accurately focus on an object of regard, sustain that focusing of the eyes, and to change focusing when looking at different distances.

Visual Perception

Stereopsis

Depth perception.

Visual-Motor Integration

Eye-hand, eye-foot, and eye-body coordination.

Visual-Auditory Integration

The ability to relate and associate what is seen and heard.

Visual Memory

The ability to remember and recall information that is seen.

Visual Closure

The ability "to fill in the gaps," or complete a visual picture based on seeing only some of the parts.

Spatial Relationships

The ability to know "where I am" in relation to objects and space around me and to know where objects are in relation to one another.

Figure-Ground Discrimination

The ability to discern form and object from background.