4.0X-450mm Ergonomic Design Binocular Loupes Magnifiers Lightweight Adjustable Magnifying Glasses Notice: 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. While treating patients and helping them achieve health, these also harmed the health of doctors. For this purpose, we have specially developed 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. Health tips: In both standing and sitting positions, the average weight of an adult's head ranges from 4.5 to 5.4 kg. When tilted, the neck load can reach 27 kg, which may lead to premature disc wear. Ergonomic Magnifying Glass with Breakthrough Capabilities Lightweight durable, adjutable puil distance, no need to bow your head when working. We have specially developed 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.There is cord to fix frame on head to reduce press on nose.Multi-layer anti-reflection coating provides extramely hight resolution. Ultra Lightweight: 51.2g Magnification: 4X Working Distance: 450mm Field of View: 70mm Depth of Field: 80mm Ergonomic Magnifying Glass: With breakthrough capabilities