iris and ciliary muscle
Iris
The Iris
Iris
iris
The iris and the ciliary body
Iris, Ciliary Body & Choroid
choroid
Choroid Ciliary body Iris
The ciliary body is behind the iris in the human eye. Tiny cilia (fibers) called zonules attach the ciliary body to the eye's lens. When focusing on close objects, the ciliary body contracts and the zonules relax, allowing the lens to thicken and improve the focus. When looking at a distant object, the ciliary body relaxes and the zonules contract, making the lens thinner for sharper distance vision.
iris and ciliary muscles
middle vascular tunic