|
Eye trackers Used in My Lab |
|
I have used three eye trackers in my lab. Currently I am using an SR-Research EyeLink 1000. This is a video-based eye tracker that records eye position 1000 times per second. I published in article in JoVE (Journal of Visualized Experiments) that includes a video describing how to use eye movements to study reading processes. The video an article are available at http://www.jove.com/video/50780. The picture below shows the desktop mount version of this eye tracker (left panel) and the experimenter’s display on the computer (right panel). The experimenter’s display shows a picture of the face and a close up of the right eye. The blue region is the pupil. The model in the picture is a former graduate student. I began using this eye tracker in May, 2006. It is the easiest to use eye tracker I have ever used. It is also very accurate.
My second eye tracker was a Model 500c, dual-purkinje-image eye tracker manufactured by Fourward Optical Technologies. Warren Ward (president of Fourward Optical Technologies) told me that I purchased the first Model 500c in production (consider this eye tracking trivia). Below is a picture. I began using the eyetracker in January, 1998 and then purchased the EyeLink 1000.
My first eye tracker was a Dr. Bouis eye tracker (manufactured by Dr. Bouis Devices for Movement Measurement in Germany). I purchased this eye tracker in January, 1994. This eye tracker was easy to use and provided excellent horizontal resolution across a limited vertical range. Importantly, it never broke down! Below are pictures of it (two views). My father (Charles Raney) and I designed and built the bite bar mount. It worked so well that several other researchers duplicated it. We also made a stabilizer for the forehead rest (the angled bar attached to the base plate) to strengthen the forehead rest (some people lean on it pretty hard). I added the head strap to try and reduce head movement. This was only needed for fidgety participants. The control panel is partially visible in the right-hand picture. The monitor stand (a stack of books) was a prototype for the advanced model (a stack of boards) seen in the picture above of the Model 500c eye tracker.
