WARM TIPS: For better observation of the product, it is recommended to use one eye during use. When using a higher magnification lens, a distance of 1-2 cm is recommended! HEAD-MOUNTED DESIGN: Our head-mounted magnifier with LED light is suitable for close-up observation. We recommend an observation distance of 1-2 cm / 0.39-0.78 inches. The head-mounted magnifier features an ergonomic frame, effectively preventing the magnifier from falling and reducing pressure on the bridge of the nose. It is lightweight and non-slip, ensuring a firm grip and reducing fatigue during prolonged use. INTERCHANGEABLE LENS: Our head-mounted magnifier includes 8 groups of interchangeable lenses: 2.5X / 4X / 6X / 8X / 10X / 15X / 20X / 25X, which can meet your close-up work needs. It is advisable to choose a lens with appropriate magnification, depending on the size of the object to be observed. The magnification can be quickly changed and stored in the included lens storage box for neat storage. SINGLE-EYE OBSERVATION: We recommend using only one eye on the double-lens magnifier to observe the object, as using both glasses simultaneously may cause the focus to blur. You can switch between the two lenses to prevent visual fatigue and effectively improve your work. Note: This magnifier with light is suitable for close-up work. Stay closer to the object to be observed. REMOVABLE: The headband and head strap of the headband magnifier are interchangeable, both allowing for secure use and reducing fatigue during prolonged use. The magnifier's adjustable headband can be folded up and down. You can rotate it to the desired position to ensure the eyeball is in the center position, allowing you to see details more clearly. Before use, it is recommended to fold up the front lens to use a single lens. VERSATILE APPLICATIONS: The head-mounted magnifier with light has a wide range of applications and is therefore very suitable for close-up work such as reading, repairing watches/circuits, crafts, jewelry identification, eyelash extensions, soldering, painting, etc. It is very suitable for assisting watchmakers, jewelers, the elderly, nearsighted or shortsighted people to observe nearby objects.