(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.
Overview. The Papaver somniferum plant, or Opium Poppy, is native to southeastern Europe and western Asia, producing white, pink, red or purple flowers in the summer and dropping its seeds in autumn.Best known for its hallucinogenic properties, Papaver plants are annuals and enjoy cooler but not freezing temperatures.he Papaver somniferum plant, or Opium Poppy, is native to southeastern Europe and western Asia, producing white, pink, red or purple flowers in the summer and dropping its seeds in autumn. Best known for its hallucinogenic properties, Papaver plants are annuals and enjoy cooler but not freezing temperatures.