To me my vision is my most valued sense. I live in Southern California, San Diego, with great weather and beautiful nature, so even though my main work is being behind the computer I also get to be active, I get plenty of exercise and eat healthy. Living long is all about doing the right things and the wrong things in moderation! Right? Which takes me back to being behind the computer and staring at it for too long. Lets make that a wider group of devices, staring for long periods at any electronic screens tend to dry out your eyes (because your are not blinking as much) and make your eye mussels lazy. To get around that, its a good I idea to take periodical breaks and move around the your office or home.