Question

Please explain Parallax error briefly and understandable...​

Answer 1

(parallax error) when the distance between the point of regard and the user (fixation distance) is different than when the system was calibrated. This error is due to the scene camera and the eye are not co-axial. Parallax error limits the use of head-mounted gaze trackers into a certain range of depth.

Answer 2

$\blue{Good\: morning @}$

A parallax error is the perceived shift in an object's position as it is viewed from different angles. ... Parallax error is an error caused by humans, while measuring a quantity if your eye is not at the proper angle to the scale you're reading, it will cause parallax error. It only depends upon the line of sight.

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