(1834â1908), Dutch ophthalmologist. Snellen was director of an eye clinic at Utrecht. In 1862 he introduced a test for measuring the acuteness of vision which consisted of printed letters or words in type of various sizes.
The poppy of wartime remembrance is Papaver rhoeas, the red-flowered corn poppy. This poppy is a common weed in Europe and is found in many locations, including Flanders, which is the setting of the famous poem In Flanders Fields by the Canadian surgeon and soldier John McCrae.
Opioids come from the plant Opium Poppy, which is botanically known as Papaver somniferum. The plant was first cultivated around 3400 B.C. This plant is also found in Europe, North America, South America, and Asia and is referred to as the common garden poppy.