(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.
Poppy seeds come from the opium poppy plant (Papaver Somniferum), which is one of the worldâs oldest known medicines.All p arts of the plant (including the seeds) contain the psychoactive alkaloids: morphine, codeine and thebane, but in very different concentrations.oppy seeds come from the opium poppy plant (Papaver Somniferum), which is one of the worldâs oldest known medicines.