Another vote for Hydrotacs. Excellent product.some on amazon ..
Rapid Eyewear BIFOCAL READY POLARIZED SUNGLASSES + 2.5. Corrective Sports Glasses for Running, Cycling, Golf, Fishing, Driving and DIY etc. For Men and Women. Built in Reading Segment: Amazon.co.uk: Health & Personal Care
or if you already have cycling glasses then how about these
Stick-On Bifocal Magnifying Lenses Hydrotac - Reading Lenses for Sunglasses (CLEAR, 2.00): Amazon.co.uk: Health & Personal Care
Been using this type of stick-on bifocal for ~10 years. Excellent. Allows reading of maps, gps, etc. via ordinary cycling glasses.Hydrotacs are brilliant if you just need readers. They stick very securely and you can swap between lenses/glasses. 👍
I second that, Colin. Boots opticians quoted me £350 when I enquired about bifocal cycling glasses. I ditched the idea fast. Then came across the BBB ones for about the same as you paid and they do exactly what I wanted them to do. The magnifying panels are discreet and unobtrusive but allow me to read maps when I want to. It did take me a few rides to get used to looking down to see what gear I was in on the cassette and whether my rear tyre looked a bit flat. It can be difficult not looking through the magnifying part. You soon get used to it though. Very good value for the money.For those of us who have decent long vision but need help reading... THESE are good. I bought a pair a few weeks ago when having problems focussing on my GPS.