[Igor Carron] pointed out that Derrick Parkhurst and his colleagues at Iowa State have been hard at work improving their lightweight eye tracker that we covered in January. The new version uses digital cameras instead of analog ones. This time they’ve included step by step build instructions instead of just a PDF describing the device. Most of the build involves removing the CCD from a couple cheap webcams and then building an extension back to the board. All of this work is part of the Human and Computer Vision Laboratory’s open-source openEyes project. If you want a quick intro into how this type of eye tracking works I suggest reading our previous post.