Comprehensive Visual Testing: Includes five standard visual tests - E symbol, astigmatism symbol, honeycomb symbol, cross symbol, and red and green symbol to address a variety of vision assessment needs. Multifunctional Digital Vision Chart: Features a word mark range of 3.7-5.1 with measurement distances of 40cm on the front and 25cm on the back. The vision expression base offers an average brightness of 80-320CD/m and a brightness uniformity of >0.85 for accurate vision testing. Brightness Adjustable: Provides remote control of the eye chart for light adjustment based on the surrounding environment with low power consumption. Offers consistent and bright illumination to ensure effective vision testing for both professional and personal applications. Material: Energy-saving LED display constructed from high-quality materials, emitting light evenly without fading, reflection, or glare. Versatile for hanging or tabletop placement. 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!