This is exactly what I was looking for. I have had clip-ons, which require all sorts of wrestling to attach them to the primary glasses, and I have had flip up versions too, which are so geeky it is almost absurd. These are perfect as the go right over my vision glasses easily and can be pulled on or off without needing exceptional dexterity. Simple, they do the job well.
I love my new wood glasses thanks.Very good sunglasses. I only wish that it came with some cleaning products.