The fluid between the cornea and iris is:

The fluid between the cornea and iris is known as the aqueous humor. This clear, watery fluid plays a crucial role in maintaining intraocular pressure, providing nutrients to the avascular structures of the eye such as the lens and cornea, and assisting in waste removal. It is produced by the ciliary body and flows from the posterior chamber (behind the iris) to the anterior chamber (between the iris and cornea), maintaining the shape of the eye and contributing to its refractive properties.

In contrast, vitreous humor is a gel-like substance that fills the space between the lens and the retina in the back of the eye, providing structural support but is not involved in the area between the cornea and iris. Choroid humor is not a recognized term in eye anatomy, though the choroid is part of the eye's uveal tract located behind the retina. Ciliary humor is also not a standard term; however, it may refer to fluid related to the ciliary body. Therefore, aqueous humor is the correct and most relevant term to describe the fluid located between the cornea and iris.