At Rest: The suspensory ligaments (zonular fibers) maintain tension on the lens, keeping it relatively flat.
During Accommodation: Parasympathetic neurons from the Edinger-Westphal nucleus stimulate the contraction of the ciliary muscle. This contraction reduces the tension on the suspensory ligaments, allowing the lens to become more convex (rounded), increasing its refractive power to focus on nearby objects.
Convergence of the Eyes
The oculomotor nerve (CN III) sends impulses to the medial rectus muscles of both eyes, causing them to converge (move inward).
This convergence ensures that the visual axes of both eyes align on the near object, allowing for binocular vision.
