making my own telescope type magnifiers?

I've been looking to buy head worn telescope type magnifiers because
the Opti-Visor and their ilk all bug my eyes. The optometrist said
this is because of two reasons in my case. First is that they don't
correct my astigmatism and second because the spacing of the lenses
doesn't match the spacing of my eyes. The least expensive of the head
worn magnifiers I have found so far is close to $400.00 US. And there
appears to be no upper limit in price. So, I'm thinking that by using
the Edmunds book "Popular Optics" for the math and design ideas, and
buying surplus coated lenses I can make my own. Any suggestions?
Thanks,
Eric R Snow
.