(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.
No, not all poppies contain opium; only one does. Among those flowers we call poppies, there are 11 genera in the subfamily Papaveraceae, and the most commonly considered poppy flowers belong to one of those genera which is the genus Papaver. In that genus, only one species contains opium, the breadseed or opium poppy (Papaver somniferum).