I want to see clearly but also to have both sun and wind protection.
Have a look on eBay for bifocal sunglasses such as these. I've bought a couple of pairs from eBay at less than £20 including p&p. Cheap as chips, wrap around sports glass style.
The other alternative is to use expensive prescription bifocal/varifocal glasses but mount flip-up sunglasses on the front (from Decathlon). Not the most stylish solution but effective.
However... depending upon where the SatNav is mounted you probably won't want a reading glass prescription. I need +2.5 for reading but my Zumo is mounted above the dials and I only need +1.5 for that distance.
Tim
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