Eye movement evaluation

The present disclosure relates to a device for providing an eye metric, comprising a display unit 7, producing a visual stimulus 13 to an eye. An eye-tracking unit 9, measures the eye's movements in response to the stimulus, and an analyzing unit 10, outputting a metric result. The display unit 7 produces a moving stimulus with at least one varying stimulus parameter such as a symbol size, and the eye-tracking unit 9 detects when the eye loses visual contact with the stimulus. The analyzing unit 10 provides a metric result based on the value of the stimulus parameter at the time when loss of visual contact was detected.