The pupil is the lack of Iris, or in other words, a hole.
Of course there is a hole but what people see as the pupil is the transparent cornea. There is no hole into the eye.
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In one respect, yes it is a hole. It is an opening created by the constriction and dilation of the pupillary muscles in the iris. However, commonly the idea of a hole is a hollow and empty space. The lens is actually in the space we consider to be the pupil. The lens is what is responsible for focusing the visual image.
No because it is connected to the iris which controls the pupil and it is also connected to the cornea that is connected to the optic nerve and sends a message to the brain