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The pearl organ is associated with a secondary retina, allowing the fish an unusually wide field of view. [2] Specifically, pearleyes can see up to 20 degrees below the horizontal despite the nearly 40-degree angle created by the tubular eyes of the pearleye above the horizontal. [ 3 ]
Scleral rings may help support inner structures of the eye, especially in animals that do not have round eyes. Animals that move rapidly, including both fast flying birds and fast swimming fish have the most robust scleral rings, indicating that these thick rings are used to protect the eye during intense changes in pressure in the air and in ...
A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as a conulariid.Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) [1] in minute crystalline form, which has been deposited in concentric layers.
Macular hole on the right eye Classification of Vitreomacular Adhesion, Traction, and Macular Hole (IVTS 2013) Macular degeneration is a condition affecting the tissues lying under the retina, while a macular hole involves damage from within the eye, at the junction between the vitreous and the retina itself. There is no relationship between ...
Rib fractures usually occur from a direct blow to the chest such as during a motor vehicle collision or from a crush injury. [2] [1] Coughing or metastatic cancer may also result in a broken rib. [1] The middle ribs are most commonly fractured. [5] [1] Fractures of the first or second ribs are more likely to be associated with complications. [6]
Scientists confirm an 8,200-solar-mass black hole in the Omega Centauri cluster using 20 years of Hubble data, shedding light on black hole formation and evolution.