equipped with LED lights, providing constant light source, uniform brightness, and soft light. It can not only accurately present the contents of the vision chart, but also meet various vision testing needs, such as myopia, hyperopia, astigmatism and color vision abnormalities. It is a practical choice for vision testing equipped with a push-type switch, the is simple and intuitive, and the light box switch can be easily controlled. With a USB interface, it is convenient to connect a variety of devices (such as power banks) for power supply. Whether it is used at home, office or school, you can get electricity at any time and use it without restrictions PS high-transparency panel and aluminum alloy frame are used. The surface is flat and smooth, hard and not easy to break. The sturdy aluminum alloy frame provides stable support for the light box, and it is not easy to deform or damage after long-term use It has two installation modes: wall-mounted and standing, to meet the needs of different scenarios. The wall-mounted design can easily decorate the wall, convenient for quick eye examination; the standing installation can be flexibly placed on the desktop and other locations, which is convenient for close-range vision testing, making vision testing more flexible 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!