the pupil
The opening in the center of the iris is called the pupil. It is responsible for controlling the amount of light that enters the eye by dilating or constricting in response to different lighting conditions. This helps to regulate the amount of light that reaches the retina at the back of the eye for optimal vision.
The opening hole of the eye is called the pupil. It is the black circular opening located in the center of the iris that allows light to enter the eye. The size of the pupil can change in response to different lighting conditions and emotions.
The black circular opening in the center of the iris of the eye
The pupil is the opening in the center of the iris (the colored part of the eye) that allows light to enter the eye. By dilating or constricting, the pupil controls the amount of light reaching the retina at the back of the eye.
The calm center of a hurricane is called the eye of the storm.
What you think it is is what it is
The iris has an opening, called the pupil, through which light enters the eye.
They are hollow so light can pass through to the retina, so you can see. The pupil is the opening in the iris. To ask why the eyes' pupils are hollow is analogous to asking why a donut hole is hollow.
A tornado does not have eyes, but an eye. That is because the circular motion causes t to have an opening in the very middle, and they call that an eye.
An example of a homograph for "pupil" is "pupil" (a student) and "pupil" (the dark circular opening in the center of the eye).
The center of a tornado is called the "eye" or "eyewall." It is a relatively calm area with lower wind speeds compared to the strong winds in the surrounding tornado.
The center of a typhoon is the eye of the typhoon. Also known as The Eye of The Storm.