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The sclera, [note 1] also known as the white of the eye or, in older literature, as the tunica albuginea oculi, is the opaque, fibrous, protective outer layer of the eye containing mainly collagen and some crucial elastic fiber. [2] In the development of the embryo, the sclera is derived from the neural crest. [3]
The Indian white-eye (Zosterops palpebrosus), formerly the Oriental white-eye, is a small species of passerine bird in the white-eye family. It is a resident breeder in open woodland on the Indian subcontinent. They forage in small groups, feeding on nectar and small insects. They are easily identified by the distinctive white eye-ring and ...
The white-eyes are small and mostly undistinguished, their plumage above being generally some dull colour like greenish-olive, but some species have a white or bright yellow throat, breast or lower parts, and several have buff flanks. As their name suggests, many species have a white ring around each eye.
The eye can be considered as a living optical device. It is approximately spherical in shape, with its outer layers, such as the outermost, white part of the eye (the sclera) and one of its inner layers (the pigmented choroid) keeping the eye essentially light tight except on the eye's optic axis.
Eye color is an inherited trait determined by multiple genes. [14] [15] These genes are sought by studying small changes in the genes themselves and in neighboring genes, called single-nucleotide polymorphisms or SNPs.
A Nepali woman with a tilaka on her forehead. In Hinduism, the tilaka (Sanskrit: तिलक), colloquially known as a tika, is a mark worn usually on the forehead, at the point of the ajna chakra (third eye or spiritual eye) and sometimes other parts of the body such as the neck, hand, chest, or the arm. [1]
Scleral tattooing. Scleral tattooing is the practice of tattooing the sclera, or white part, of the human eye.Rather than being injected into the tissue, the dye is injected between two layers of the eye, then gradually spreads.
A captive white tiger at the Singapore Zoo. The white tiger, or bleached tiger, is a leucistic morph of the tiger.It is occasionally reported in the Indian wilderness. It has the typical black stripes of a tiger, but its coat is otherwise white or near-white, and it has blue eyes.