Thanks for your reply. As we had already raised almost 2000 pounds from a GoFundMe campaign we bought the latest M5 pro iPad as that's what we could afford so far. However Eye Tracking on an iPad is difficult enough for a person with normal vision, so for Pete it's a taster for what's to come. We also demoed 'eye gaze' which is a much more expensive version of Eye Tracking, however the future in my opinion is Vision Pro because Pete will experience so much more with 3d technology.