prism and monocle?

[Johan Vos]

This is probably a dumb question, but now that I have the monocle glass
implementation instead of lens running on Android/Dalvik, I am a bit
confused with prism/es2/monocle, since it contains duplicate files of
prism/es2/eglfb?
The OpenJFX wiki is very clear in explaining Monocle as a glass
implementation, but I don't understand yet why it also appears in prism?

- Johan