The participant feature settings provide information about the eyes of the participant. These sessings enable the system to adjust for the best possible performance.

These settings can be written to a settings file .eyevec-participantrc (in your home directory) using the eyevec-control application. This makes the participant settings persistent across eye-tracking sessions. You can edit the settings file using any plain text editor.

You probably should only save participant settings if you want to tweak the defaults a bit or if you are the main user of the eye-tracker.

See also: Participant feature settings functions

Details

The names of all settings are in lowercase with dashes between the parts that make up the name. In the settings file however the dashes are removed. For instance the setting named iris-diameter is called irisdiameter in the settings file. Settings prefixed with left- or right- will use prefix left_ resp. right_ in the settings file.

Name Valid range / options Default Description

age-years

[0, 99]

20

Age [years]

This setting controls the default interpupillary distance and iris diameter.

age-months

[0, 11]

0

Age [months]

This setting controls the default interpupillary distance and iris diameter. This setting will be ignored if age-years is above 5.

expected-noise-level

[0.5, 3.0]

1.0 (depends on age)

Expected relative noise level

This is a multiplication factor that will be applied to the acceptable and too high pupil and CR noise level thresholds
(see acceptable-pupil-noise-level etc.).

interpupillary-distance

[40, 70]

60.6 (depends on age)

Interpupillary distance [mm]

This assumes the participant is looking at the center of the calibration plane.

dominant-eye-weight

[0.5, 1]

0.75

Relative weight of the dominant eye

Used in point of gaze estimation.

left-iris-diameter

[11, 14]

12 (depends on age)

Left eye: Iris diameter [mm]

right-iris-diameter

[11, 14]

12 (depends on age)

Right eye: Iris diameter [mm]

left-baseline-pupil-diameter

[2.5, 6]

4.5

Left eye: Baseline pupil diameter [mm]

right-baseline-pupil-diameter

[2.5, 6]

4.5

Right eye: Baseline pupil diameter [mm]

left-eyelash-direction

0: upwards pointing eyelashes
1: straight pointing eyelashes
2: downwards pointing eyelashes

0

Left eye: Eyelash direction

right-eyelash-direction

0: upwards pointing eyelashes
1: straight pointing eyelashes
2: downwards pointing eyelashes

0

Right eye: Eyelash direction

left-visual-aids

0: no visual aids
1: spectacles
2: contact lenses

0

Left eye: Visual aids used

right-visual-aids

0: no visual aids
1: spectacles
2: contact lenses

0

Right eye: Visual aids used

left-iris-occlusion

0: none (iris (almost) fully visible, pupil visible, corneal reflection visible)
1: mild (iris slightly occluded, pupil visible, corneal reflection visible)
2: moderate (iris partly occluded, pupil (partly) visible, corneal reflection not always visible)
3: severe (iris severely occluded, pupil partly visible, corneal reflection not visible)

1

Left eye: Iris occlusion level

right-iris-occlusion

0: none (iris (almost) fully visible, pupil visible, corneal reflection visible)
1: mild (iris slightly occluded, pupil visible, corneal reflection visible)
2: moderate (iris partly occluded, pupil (partly) visible, corneal reflection not always visible)
3: severe (iris severely occluded, pupil partly visible, corneal reflection not visible)

1

Right eye: Iris occlusion level

left-eye-is-lazy

0: false
1: true

0

Left eye: If set, eye is lazy (can’t be used in point of gaze calculation)

right-eye-is-lazy

0: false
1: true

0

Right eye: If set, eye is lazy (can’t be used in point of gaze calculation)

left-eye-is-dominant

0: false
1: true

0

Left eye: If set, eye is dominant over the other eye

right-eye-is-dominant

0: false
1: true

0

Right eye: If set, eye is dominant over the other eye

left-eye-is-detectable

0: false
1: true

1

Left eye: If set, eye is detectable

right-eye-is-detectable

0: false
1: true

1

Right eye: If set, eye is detectable