User manual

In general, after threshold adjustment, pupil thresholds should be between 75

and 110 and corneal thresholds should not exceed 230. If the pupil threshold is

too low, try increasing the illumination output. If the pupil threshold or corneal

thresholds are too high, try reducing the illuminator output.

Pupil Clipped and Lost

Good

Corner shadow captures

pupil

Figure 3-17: Corner Effects Seen with Head Rotation

EyeLink 1000 Desktop and Arm Mount Users: If the pupil crosshair flickers

on and off or becomes missing even though the pupil is clearly visible then the

pupil size may be too small, please check the camera distance and the

illumination level. Consider placing the Desktop Mount closer to the subject

(between 40 and 70 cm from the subject’s eye) and/or increasing the

illuminator power level.

3.4 Setting the Corneal Reflection (CR) Threshold

For typical experiments, the “Tracking mode” should always be set to pupil-CR

mode, regardless whether you plan to use the built-in chinrest or not. The

pupil-only mode should only be used together with a bite bar. The corneal

reflection, if present, is identified by a yellow circular shape surrounded by a

crosshair.

Good Corneal Reflection

Poor Corneal Reflection

Figure 3-18: Corneal Reflection

An EyeLink 1000 Tutorial: Running an Experiment