The idea has been cooking in my mind for quite a while, and I actually wanted to use it for another design contest (TI's ADC). But the hackaday contest is so much cooler, so I decided to have a go at it, despite it may not be very "connected".

The progress so far is a good idea on how the eye focus sensor can actually be made. So, the project is in the planning stage - nothing has been built yet.

The sensor would rely on the red-eye effect (aka cat's eye), which is the strongest when a light source and a sensor are both in focus on the same spot of the retina.