efficient but a little big

The correction of diopters is good (it works for nearsighted to 5 diopters).
Much better than no one sees.
Stability is improved.
One little better manage verticality.
The manual focus is possible.
And when you become presbyopic, great ....
This version is without a magnifying glass, magnifying glass just be added as an option, but already I see without my screen pixel (920,000 points).