I've ordered from WidmoVR a couple times. Very good. Lenses snaps on and stays on.
They also have videos on how to install them. That helped during Rift S installation as I didn't realize I had to remove the original lens frames first.
After much research.
I had an eye test, for the correct lenses, and ordered from VR optician.
Went with the blue tint.
They cost me a whopping £92. Hope their worth it.
Don't know how long they will take to arrive.