(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.
The Corn poppy (Papaver rhoeas) is a wild growing papaver species, which usually has got red tepals around a black center. This poppy is the largest and most common of three wild papaver species in Denmark, and it has got its name because it was earlier common as a weed in the corn.Its natural habitat is most of Europe, North Africa, Caucasus, Iran and the Indian subcontinent.he close relative Papaver somniferum, the opium poppy, is cultivated in many places for extraction of opium from the sap of the seed capsules. The opium poppy is about 30 -90 cm tall, it has large white or pale purple or variegated flowers during summer.