Zcifi Stick-on Bifocal Prescription Lenses are soft, pliable plastic lenses shaped in a half-moon. This ultra-thin design clings to the inside of your sunglasses through molecular attraction. No adhesives are needed and these flexible lenses leave no residue. They are instantly installed with water and may be removed or reinstalled at any time you choose. Size 3cm across 1.8cm depth.Great for sunglasses and being able to see your Garmin,I have 2 unopened sets , retail at £15
£10 a set free UK 2nd class postage.