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There is a widespread assumption that the peak velocities of visually guidedsaccades in the dark are up to 10~\% slower than those made in the light.Studies that questioned the impact of the surrounding brightness conditions,come to differing conclusions, whether they have an influence or not and if so,in which manner. The problem is of a complex nature as the illuminationcondition itself may not contribute to different measured peak velocitiessolely but in combination with the estimation of the pupil size due to itsdeformation during saccades or different gaze positions. Even the measurementtechnique of video-based eye tracking itself could play a significant role. Toinvestigate this issue, we constructed a stepper motor driven artificial eyewith fixed pupil size to mimic human saccades with predetermined peak velocity\& amplitudes under three different brightness conditions with the EyeLink1000, one of the most common used eye trackers. The aim was to control thepupil and brightness. With our device, an overall good accuracy and precisionof the EyeLink 1000 could be confirmed. Furthermore, we could find that thereis no artifact for pupil based eye tracking in relation to changing brightnessconditions, neither for the pupil size nor for the peak velocities. What wefound, was a systematic, small, yet significant change of the measured pupilsizes as a function of different gaze directions.

RELAY: Robotic EyeLink AnalYsis of the EyeLink 1000 using an Artificial Eye