Answer :
Final answer:
The vascular tunic is the middle layer of the eyeball wall, containing crucial structures like the choroid, ciliary body, and iris.
Explanation:
The middle layer of the wall of the eyeball is the Vascular tunic. This layer includes the choroid, ciliary body, and iris. The choroid provides a blood supply to the eyeball, and the iris controls the size of the pupil.
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