Going a little bit further, there's the time between the frame displaying on the screen and it reaching your retina, then the time between that and it reaching

Going a little bit further, there's the time between the frame displaying on the screen and it reaching your retina, then the time between that and it reaching your brain in the form of electro-chemical signals, then the time between that and your brain decoding it. By the time you perceive anything, and even more so by the time you react to it, it's already in the past. There is no "now", it's all an approximation.