Adjustable Brightness: The eye chart features adjustable brightness with two levels. The switch located at the bottom allows users to set the brightness according to their preferences. Convenient Measurement: This device measures visual acuity at a distance of 30cm from the observer's position. It provides easy monitoring of vision for both children and adults. Standard Logarithmic Near Vision Meter: Equipped with a rechargeable LED, this meter offers clear vision markers for accurate measurement. It can be handheld, hung, or placed on a countertop, making it suitable for near vision testing. LED Eye Chart: The energy-efficient LED screen is constructed from high-quality materials, ensuring safety, reliability, and durability. It produces no reflection or glare, making it ideal for eye exams. Versatile Use: An excellent choice for optometrists, eye care specialists, and educators. Ideal for use in homes, schools, and offices.