Hi Pablo,
I would like to help you, but I am not sure that the EyeX eye tracker is the right choice for you, since it is more of a low-cost, consumer-grade eye tracker rather than a research tool. On the Tobii Developer Zone we are focusing (!) on using eye tracking for creating new user experiences in consumer applications and games. The Research & Analysis branch of Tobii have better offerings for researchers. If your goal is to do ophthalmology research, you can start by taking a look at this page:
http://www.tobii.com/en/eye-tracking-research/global/research/ophthalmology/