(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.
(Photo: AP). Papaver somniferum, one of the few species of poppy that produces opium, is an annual plant with a growth cycle of 120 days. Farmers plant seeds, which range in color from white to yellow to brown and gray, in shallow holes.apaver somniferum, one of the few species of poppy that produces opium, is an annual plant with a growth cycle of 120 days.