This Ergo magnifying glass to reduce the pressure on the back, neck, and eyes of doctors during work, allowing them to work healthily, easily, and efficiently When you take care of others, Ergo magnifying glasses help protect your bone health, making it easy and comfortable for you to work every day Ergonomic magnifying glass with breakthrough capabilities.Breaking the concept of tilt angle, dentists used to work with their heads down, even when wearing magnifying glasses, they still had to lower their heads down There is cord to fix frame on head to reduce press on nose.Muli-layer anti-reflection coating provides extramely hight resolution. Lenses IPD can be adjusted synchronously by the knob