What term is used for the opening in the center of the iris?

The term used for the opening in the center of the iris is the pupil. The pupil is a crucial component of the eye's anatomy, as it serves as the aperture through which light enters the eye. The size of the pupil can change in response to light conditions; it constricts in bright light to reduce the amount of light entering the eye and dilates in low light to allow more light in, enhancing the ability to see in varying lighting conditions.

In contrast, the cornea is the transparent front part of the eye that covers the iris and pupil, playing an essential role in focusing light. The fovea, a small depression in the retina, is where visual acuity is highest and is not related to the iris or the pupil. The term "forvea," while sounding similar, is a misspelling of fovea and has no recognized meaning in ophthalmic terminology. This clarification highlights why the pupil is the specific term used for the center opening of the iris.