Monoyer visual acuity scale

What great luck! Original luminous board composed of a cream white metal body supporting a plexiglass plate screen-printed with letters and numbers: the visual acuity measurement scale. It was invented in the 19th century by Ferdinand Monoyer from Lyon. It is electrified, has a double red and green switch on the side and lights up. A trendy and eye-catching object of curiosity. Dimensions: height: 78 cm; width 27 cm and depth 12 cm. Weight between 5 and 15 kg. Condition: photos are part of the description. Shows signs of wear. This object tells you its story. He is sincere, genuine and true: in a word, authentic.