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Diaphragm (optics)
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In optics, a diaphragm is a thin opaque structure with an opening at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it i
Pentacon 2.8/135 lens with 15-blade iris
Pentacon 2.8/135 lens with 15-blade iris
Aperture mechanism of Canon 50mm f/1.8 II lens, with five blades
Aperture mechanism of Canon 50mm f/1.8 II lens, with five blades
In the human eye, the iris (light brown) acts as the diaphragm and continuously constricts and dilates its aperture (the pupil)
In the human eye, the iris (light brown) acts as the diaphragm and continuously constricts and dilates its aperture (the pupil)
Iris (anatomy)
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The iris is a thin, ring-shaped 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.
Diaphragm (optics)
…system of quantification of varying the opening in the diaphragm. A natural optical system that has a diaphragm and an aperture is the human eye. The iris is the diaphragm, the pupil is the aperture. In the human eye, the iris can both constrict and dilate, which varies the size of the pupil. Unsurprisingly…
The iris in humans is the colored (typically brown, blue, or green) area, with the pupil (the circular black spot) in its center, and surrounded by th
The iris in humans is the colored (typically brown, blue, or green) area, with the pupil (the circular black spot) in its center, and surrounded by the white sclera.
The iris (brown coloured portion of the eye) controls the size of the pupil by contracting the sphincter pupillae and dilator pupillae muscles.
The iris (brown coloured portion of the eye) controls the size of the pupil by contracting the sphincter pupillae and dilator pupillae muscles.
Light micrograph of the iris near to the pupil. M. sph. sphincter muscle, L lens
Light micrograph of the iris near to the pupil. M. sph. sphincter muscle, L lens
Among human phenotypes, blue-green-gray eyes are a relatively rare[citation needed] eye color and the exact color is often perceived to vary according
Among human phenotypes, blue-green-gray eyes are a relatively rare[citation needed] eye color and the exact color is often perceived to vary according to its surroundings.