(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. Home Â» Opium. Opium is a naturally occurring narcotic found in the seeds of the opium poppy plant and contains morphine. Opium can be extracted to produce heroin, an illegal drug that has a high abuse potential. The cultivation of opium poppies dates back many civilizations in an effort to provide pain relief and deep sedation.