The invention relates to an eye tracking device (10a； 10b； 10c) comprising a processing unit (18) and an optical system (14), which comprises a capturing unit. The optical system (14) provides a first optical path (P； P1) with a first imaging property and a second optical path (P； P2) with a second imaging property and the capturing unit (C； C1, C2) captures a first image (24a) by capturing light that has passed along the first optical path (P； P1) and a second image (24b) by capturing light that has passed along the second optical path (P； P2), so that due to the difference of the first and second imaging property the first (24a) and the second image (24b) comprise a difference related to a characteristic of at least part of the first and the second image (24b), wherein the eye tracking device (10a； 10b； 10c) is configured to determine a property of the eye (12) on the basis of at least one of the first image (24a) and the second image (24b).
