The invention belongs to the technical field of eye movement instruments, and in particular relates to an eye movement instrument and an image processing method. The eye tracker proposed by the present invention includes: a head-mounted main body; a plurality of front cameras, and the plurality of front cameras are arranged on the head-mounted main body at intervals along the circumferential direction, and at least two of the plurality of front cameras can At the same time, the image information of the target scene in front of the head-mounted main body is collected; the control system arranged on the head-mounted main body is connected to the front camera, so that the control system can perform three-dimensional reconstruction of the target scene based on the image information, And/or measure the distance of at least one object in the target scene based on the image information, so as to have a wider collection range and field of view. Moreover, the eye tracker of the embodiment of the present invention has a simple structure, is convenient to use, is comfortable to wear, is safe and reliable.