(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.
Opium is a drug made from the poppy plant. Poppies grow in many different countries but most poppies today are used to make heroin and opium is much less popular than in was i â¦ n the past. In the past opium was widely used for both medical and recreational purposes. Opium is not made, rather it is drained from the seed pods of mature poppy plants (of the opium variety). Once a mature plant drops its flowers, the seed pod becomes rip â¦ e after 5-12 days.