It uses energy-saving LED constant light source, which emits light evenly without flickering, providing a comfortable and stable light source environment for vision testing. At the same time, it has low power consumption and will not generate high electricity bills, saving you the cost of use The acrylic panel is sturdy, wear-resistant and not easy to break, which can well protect the internal vision chart; the aluminum alloy frame provides stable structural support. The combination of the two not only improves the overall texture of the light box, but also enhances its anti-deformation ability and prolongs its service life The ultra-thin frame of only 2cm makes the light box look small and exquisite as a whole, saving installation space. Whether it is hung on the wall or placed in a specific position, it will not appear abrupt. It can be cleverly integrated with various environments, combining practicality and beauty As a vision testing tool, its clear vision chart can accurately measure vision, help detect vision problems such as astigmatism, myopia, hyperopia, red and green color deficiency, etc., provide reliable support for the work of professionals such as optometrists and doctors, and also facilitate daily vision monitoring for families Service: We place great emphasis on our customers' shopping experience. If you have any questions, please feel free to contact us; we will respond to you within 24 hours!