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If the eyelids are open for a few hours after death, a film of cell debris and mucus forms two yellow triangles on the sclera, each at side of the iris, with base towards the margin of cornea and apex towards medial or lateral canthus of the eye, which becomes brown and then black within a few hours, upon which dust settles and the surface ...
The iris consists of two layers: the front pigmented fibrovascular layer known as a stroma and, behind the stroma, pigmented epithelial cells.. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae), which pull the iris radially to enlarge the pupil, pulling it in folds.
Brushfield spots are small, white or greyish/brown spots on the periphery of the iris in the human eye due to aggregation of connective tissue, a normal constituent of the iris stroma. The spots are named after the physician Thomas Brushfield, who first described them in his 1924 M.D. thesis. [1]
The scale consists of 20 colors [97] ranging from light blue to dark brown-black, corresponding to natural eye colors caused by the amount of melanin in the iris: [98] [99] Normal eye colors range from the darkest shades of brown to the lightest tints of blue. [ 14 ]
Central heterochromia is also an eye condition where there are two colors in the same iris; but the arrangement is concentric, rather than sectoral. The central (pupillary) zone of the iris is a different color than the mid-peripheral (ciliary) zone. Central heterochromia is more noticeable in irises containing low amounts of melanin. [32]
Iris gatesii is a species in the genus Iris, ... purple, or nearly black, spots, dots, short broken lines, or veining. They have a brownish purple or purple beard ...
Uveal melanoma; Other names: Intraocular melanoma [1]: Iris melanoma: Specialty: Oncology: Symptoms: A sensation of flashes or specks of dust (floaters); growing dark spot on the iris; change in the shape of the pupil; poor or blurry vision in one eye; loss of peripheral vision in one eye.
Aniridia is a condition characterized by the absence or near absence of the iris, the colored, muscular ring in the eye that controls the size of the pupil and regulates the amount of light entering the eye. This absence results in a primarily black appearance of the central eye.