Lens Zonules

This is a patient with an iridodialysis, which is a section of the iris that has a hole in it near it’s insertion.  Through that hole you can see the edge of the lens and the zonules that support the lens.  The zonules are thousands of thin strings that surround the lens and connect it to the ciliary body, the muscle that is responsible for focusing.  It’s interesting that the lens of the eye is actually suspended in the by these cords.  When the muscle contracts for focusing at near, the zonules relax, allowing the lens to fatten in the middle, changing it’s refractive power.  We don’t often get to see the zonules.  If you click on the picture to enlarge it you may see the zonules more. 

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