This post with videos explain what the Garmin Varia Vision and Garmin Rear Light Radar do. The Garmin Varia Vision is a very slick, well-designed Heads Up Device that enables you to read the data on your Garmin Edge bike computer without having to take your eyes off the road. It fits easily to your cycling glasses, and is light weight. And the Garmin Rear Light Radar makes you more visible to motorists, and also alerts you to vehicles approaching from behind. The aim is safety, of course. But many people wonder if these high tech gadgets are worth their high price? Well, right now they are on sale, so it’s a good time to evaluate them and decide if they are luxuries, or if they are something you need.