(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.
Brief Summary. Papaver somniferum, opium poppy, is an annual herbaceous plant in the Papaveraceae (poppy family) that originated in southeastern Europe and western Asia, and are now widely cultivated in Europe, Asia, China, and North Africa for their seeds, which are used in baking, as a condiment, and for their edible oil.
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.ome species are monocarpic, dying after flowering. Poppies can be over 4 feet tall with flowers up to six inches across. The flowers have 4 to 6 petals, many stamens forming a conspicuous whorl in the centre of the flower and an ovary consisting of from 2 to many fused carpels.