The pupil is the round-shaped black part located in the center of the eyes. The pupil is not exactly an organ, but a hole that allows light to enter the eyes. The pupil is enclosed in the iris, the part of the eye, which decides eye color. The black color of the pupil is because the rays of light entering through the pupil are absorbed by the retina which processes vision.
The pupil can be seen as the aperture of the eye. Humans and animals have different pupil structure. Have you seen the pupil of your pet cat? It appears vertically slit as opposed to the round shape of your pupil.
Pupils, along with iris, adjust the entry of light into the eyes. For instance, if we are in a brightly lit room, the ciliary muscles aid the pupil to contract and let only the optimum amount of light to enter the eyes. The pupil will dilate in case of a dark room to accommodate as much as light to enter the eyes to help us see.
A human pupil can be compared to that of a camera. As the lens of a camera has an aperture, the pupil can be considered the aperture of the human eye. The light rays entering through the pupil will incident on the retina after converging. This is exactly what happens to light rays in a camera.
The pupil is an integral part of the eye which needs to be taken care of for having good eyesight.
Many defects befall the eyes due to changes in the characteristics of the pupil. Overexposure to high-intensity light for prolonged periods can damage the elasticity of the muscles that aid the iris and the pupil to contract and expand according to the light setting. Concentrated reading or staring in the smartphone or computer for long hours can add to the degeneration of the pupil. Keeping the health of the eyes is important as is keeping the health of the rest of the human body.
Things to do for better eye health/pupil health:
At www.pupilsdistance.com, you can measure the pupil to pupil distance with great ease. Once you have the monocular and binocular pupillary distance values, you can go online to shop eyeglasses.
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