Human eye The upper end of the range is given in terms of normal visual performance as 10 cd/m (100,000,000 or one hundred million candelas per square meter). The eye includes a lens similar to lenses found in optical instruments such as cameras and the same physics principles can be applied. The pupil of the human eye is its aperture; the iris is the diaphragm that serves as the aperture stop. Refraction in the cornea causes the effective aperture (the entrance pupil) to differ slightly from the physical pupil diameter. The entrance pupil is typically about 4 mm in diameter, although it
A Flower in a Sinful Sea addition the word sounds similar to "hua" (T: 華, S: 华, P: "huá", W: "hua"), meaning China. The title has also been translated as "Flower in a Sea of Sin", "Flower in the Sea of Retribution", "Flower in the World of Retribution", "Flower in a Sea of Karma", "Flower in the Sea of Evil" or "A Flower in an Ocean of Sin". In the earlier versions of the novel by Jin Tianhe, Sai Jinhua, a courtesan, travels to the west with her husband, a scholar. They meet Russian anarchists and the novel describes the history of the Russian anarchist movement.