Ferdinand Monoyer, born this day, 9th May 1836, invented the Monoyer chart used to test visual acuit

Ferdinand Monoyer, born this day, 9th May 1836, invented the Monoyer chart used to test visual acuity.
To celebrate I’m offering 20% off the cost of my Friesian Eye Chart(actually based on the Snellen chart of 1862) until the end of the week. Just enter the code MONO20 at the checkout.

Find the pattern in my Etsy shop: Quiltify Design.
www.etsy.com/uk/shop/QuiltifyDesign