The film because it forms the real image just like the retina.
The iris is like the aperture part of a camera, which used to also be called the iris.
the iris
The iris acts like the aperture of a camera lens.
iris
The iris diaphragm is named after the iris, the colored part of the eye, because of its similar appearance and function. Just like the iris controls the amount of light entering the eye, the iris diaphragm in a camera lens controls the amount of light entering the camera.
The part of the eye that functions similarly to a shutter release is the iris. The iris controls the size of the pupil, which regulates the amount of light that enters the eye, much like a camera's shutter controls light exposure. When light levels change, the iris adjusts the pupil's size to ensure optimal vision, similar to how a camera shutter opens and closes to capture an image.
Like fingerprints, a person's iris is unique. An iris scan is accomplished by a system that uses a device like a digital camera to record details about a person's iris. The image is converted to an iris code and stored in a database for future use.
The radial and circular muscles of the iris.
It is identical in action to the iris in your eye, it widens and narrows to allow only the required amount of light through the aperture hole/pupil
The part of the eye that is similar to the shutter in a camera is the iris. It regulates the amount of light entering the eye by adjusting the size of the pupil, functioning like a camera's aperture to control the amount of light reaching the retina.
As in a camera, this part is usually called an iris diaphragm. It can make the aperture bigger to let in more light, or smaller to make the image sharper. The shutter in a camera is not the same thing.
In photography, the iris refers to the part of the camera lens that controls the amount of light entering the camera, while the aperture refers to the opening in the lens that allows light to pass through. The iris adjusts the size of the aperture to regulate the exposure of the image.