Eye Chart Light Box Eye charts are standard tools for measuring vision and detecting common vision problems such as astigmatism, nearsightedness, farsightedness, and red green color weakness. This device provides a reliable reference for screening and monitoring. No fading and no glare: The layout fonts are printed with inkjet technology for clear, durable readability. The frosted panel light box reduces glare, and the surface is easy to clean by wiping with a rag. Sturdy and portable: The eye chart is printed on a hard, heavy, plastic card, so it can be carried in a pocket without staining. The card measures 7.75 x 5.79 inches, making it convenient for carrying around. Two power supply modes: The LED vision test board offers two power supply modes to suit different environments, allowing testing anytime and anywhere. Use scenarios Clinical use: Carry in a physician's or nurse's pocket for quick vision screening during exams or patient visits. Use in bedside testing or in portable clinics to assess visual acuity efficiently. Home or family use: Suitable for regular self checks or helping other family members monitor vision between professional eye exams. Travel or outreach: Compact and durable for field screenings in schools, community health events, or traveling clinics, enabling vision testing wherever needed.