Thread: Has anyone used one of these Optics/Sights

I do not know anything about them and cannot understand what I read about them
Can someone who uses or has used them explain the basics?

Have just taken ownership of a very nice Baikal 7.62x39 and has open "peep sights" but I cannot see without glasses and when looking along with glasses it don't line up and I am looking over glasses.

So these style optics in question

Can I adjust a diopter for my very poor sight like a normal Scope?
How does one sight in
I only have 1/2" Dovetail for mounting (but could adapt weaver rail)

Lastly
Way are they so Forking expensive???