(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.
The morphine poppy, Papaver somniferum, was first grown commercially on British farms in 2002 and now it can be seen around Dorset, Lincolnshire, Oxfordshire and Hampshire. This spectacular field will flower, then the crop will be left to die off and dry out before it is harvested with special machinery.