1. A method for detecting blink, comprising: obtaining an eye image sequence of a user; obtaining a currently analyzed image and a previously captured image from the eye image sequence; filtering reflective regions of the currently analyzed image and the previously captured image, wherein brightness values of pixels included in the reflective regions are higher than a brightness threshold; calculating a difference pixel amount between the currently analyzed image and the previously captured image; and determining whether the user blinks according to the difference pixel amount.