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  2. Limbal ring - Wikipedia

    en.wikipedia.org/wiki/Limbal_ring

    Limbal ring. Prominent limbal ring. Light brown iris with a distinct limbal ring. A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. [1] It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. [2]

  3. Halo (optical phenomenon) - Wikipedia

    en.wikipedia.org/wiki/Halo_(optical_phenomenon)

    A halo (from Ancient Greek ἅλως (hálōs) 'threshing floor, disk') [1] is an optical phenomenon produced by light (typically from the Sun or Moon) interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky.

  4. Phosphene - Wikipedia

    en.wikipedia.org/wiki/Phosphene

    Hermann von Helmholtz and others have published drawings of their pressure phosphenes. One example of a pressure phosphene is demonstrated by gently pressing the side of one's eye and observing a colored ring of light on the opposite side, as detailed by Isaac Newton. [7] [8] [9]

  5. Olympic symbols - Wikipedia

    en.wikipedia.org/wiki/Olympic_symbols

    The first five-ringed symbol of the Olympic Games used between 1913 and 1986. The second five-ringed symbol of the Olympic Games used between 1986 and 2010. There are five interlocking rings, coloured blue, yellow, black, green, and red on a white field. These together are known as the "Olympic rings."

  6. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    Eye color. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [3] : 9. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of ...

  7. Kayser–Fleischer ring - Wikipedia

    en.wikipedia.org/wiki/Kayser–Fleischer_ring

    KayserFleischer rings ( KF rings) are dark rings that appear to encircle the cornea of the eye. They are due to copper deposition in the Descemet's membrane as a result of particular liver diseases. [1] They are named after German ophthalmologists Bernhard Kayser and Bruno Fleischer who first described them in 1902 and 1903.