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  2. Iris (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Iris_(anatomy)

    The iris (pl.: irides or irises) is a thin, annular structure in the eye in most mammals and birds that is responsible for controlling the diameter and size of the pupil, and thus the amount of light reaching the retina. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm. Eye color is defined by the iris.

  3. Human eye - Wikipedia

    en.wikipedia.org/wiki/Human_eye

    An area termed the limbus connects the cornea and sclera. The iris is the pigmented circular structure concentrically surrounding the centre of the eye, the pupil, which appears to be black. The size of the pupil, which controls the amount of light entering the eye, is adjusted by the iris' dilator and sphincter muscles.

  4. Aperture - Wikipedia

    en.wikipedia.org/wiki/Aperture

    In humans, the average iris diameter is about 11.5 mm, [23] which naturally influences the maximal size of the pupil as well, where larger iris diameters would typically have pupils which are able to dilate to a wider extreme than those with smaller irises. Maximum dilated pupil size also decreases with age.

  5. Mammalian eye - Wikipedia

    en.wikipedia.org/wiki/Mammalian_eye

    Between birth and age 13 the eye attains its mature size. It weighs 7.5 grams and its volume is roughly 6.5 ml. Along a line through the nodal (central) point of the eye is the optic axis, which is at a slight slant of five degrees toward the nose from the visual axis (i.e., the section going towards the focused point of the fovea).

  6. Pupil - Wikipedia

    en.wikipedia.org/wiki/Pupil

    Light enters the eye through the pupil, and the iris regulates the amount of light by controlling the size of the pupil. This is known as the pupillary light reflex. The iris contains two groups of smooth muscles; a circular group called the sphincter pupillae, and a radial group called the dilator pupillae. When the sphincter pupillae contract ...

  7. Yes, You Can Rent Out Your Eye Socket For Money

    testkitchen.huffingtonpost.com/eyedynasty

    n November 1954, 29-year-old Sammy Davis Jr. was driving to Hollywood when a car crash left his eye mangled beyond repair. Doubting his potential as a one-eyed entertainer, the burgeoning performer sought a solution at the same venerable institution where other misfortunate starlets had gone to fill their vacant sockets: Mager & Gougelman, a family-owned business in New York City that has ...

  8. Pupillary distance - Wikipedia

    en.wikipedia.org/wiki/Pupillary_distance

    Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object. [2] Near PD is the separation between the visual axes of the eyes, at the plane of the spectacle lenses, as the subject fixates on a near object at the intended working distance. [3]

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