Discussion: 1 contact

The stronger the reading contact the fuzzier the distance vision can be. Trick is to train the brain to switch between eyes. If it is too slow try shutting the eye that you don't want to use ie if the distance vision is too fuzzy shut the reading eye for a few seconds to make the brain switch eyes. It can take a bit of practice

My brain has been practising switching for about 25 years. I have one long sighted and one short sighted eye. Started with one normal and one short. My prescription is dual focus. Unfortunately, the last time I ask, my eyes weren't suited to contacts. Hence almost perfect navigation on Sunday, utterly hopeless today. In the end, gave up with my fogged glasses and ran with them in my hand. Distance vision was much better, but needed the map 10 cm from my face to read, and then switch to map memory.. After making the switch, navigation improved, though speed was little better.

Wow. I know I'm eventually going to have this problem too - that is when I get as old as you I guess Jim!!!
I'm currently short sighted, so I have no trouble reading the map, but wear contacts for long distance vision orienteering. As I age, my short sightedness will eventually deteriorate and I'll need vision assistance for reading the map, which may mean one contact for distance, one for short stuff. Not looking forward to that. They do apparently make a contact which has correctness for both, (I think circular rings of different strength on the contact) but already my optometrist told me my eyes won't be suitable for this.
Maybe if we run together then Jim, you can look ahead, and I'll read the map - you may have to carry me as well so I can keep up !!