ErgoAm is a refractive loupe that use lenses to refract, or bend, light in order to create a magnified image of an object being viewed. The advanced optics allows you to keep your head completely upright while working which reduces strain especially during long procedures. Try it out during the demo to see if its the right loupe for you. ErgoAm comes in 3.5x, 4.0x, 5.0x and 6.0x magnification. Prescription Inserts for Loupes are small, custom-made lenses that clip into the frame behind the loupes. They’re tailored to your exact vision prescription and help keep your loupes compact and ergonomically correct.