I went with bifocal safety glasses like these on eBay. Item 200468129906 Dirt cheep and work well. Go to the local drug store and test their reading glassed to get the right power at around 12 to 18 inches and you'll be in business. I really like the close fit to keep the sun from getting in over the top, and they stay put. I can read the trip computer and fix a flat and all for less than $15.

Greg