(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.
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.