Fuzzy GPS
Despite the image you sometimes see in the media of reckless young things flinging themselves off near-vertical slopes, in practice the majority of mountain bikers are middle-aged. This is doubtless something to do with the cost of a typical 'decent' mountain bike. And of course when you get just a little older, your eyesight starts to go and you need reading glasses. No problem, you generally don't combine mountain biking with reading a good book, at least not simultaneously. However, there comes a stage when the GPS handily mounted on your handlebar is also fuzzy. It is possible to tweak the GPS a bit to increase the contrast (different map, back-lighting on, etc), but still, it was getting to the stage where I was having to stop and peer at it closely every time I came to a turning. My optician told me that varifocus lenses were a bad idea on the mountain bike as that messes up your ability to judge distances. You can get special cycling glasses which take prescription lenses, but that is very expensive.
What to do? I have found a solution! You can get thin plastic lenses which simply stick to the inside of your normal cycling glasses with a drop of water. They are made by Hydrotac and only cost about €20. They are like the reading bit of a bifocal lens, so that when you are cycling you just look over them, but when you look at your GPS , it is in focus. Being made of thin plastic, you can just cut them with scissors so that they fit exactly to the bottom of your glasses. You can peel them off and stick them on again as well. Doubtless the optical quality is not comparable with 'real' lenses, but seeing you normally look over them and only occasionally glance through them to look at the GPS, that is no problem. An additional trick is to only use one, for your dominant eye, then when you buy a pair you can use it for two pairs of glasses, or keep one as a spare.
