(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 opium fields of England: Pictures show the flowers blooming in Britain to make morphine for the NHS. At first glance these pictures show depressingly familiar scenes of fields of poppies in the wilds of strife-hit Afghanistan - soon to be processed into heroin and shipped around the world. But these scenes were actually captured at an 88 acre farm near Winchester in Hampshire.