The Zonula of Zinn is the anatomical medium by means of which the ciliary muscle and the lens. Which are not in direct contact. Are brought together. Without a. Perfect and regular development of this structure, perfect power of accommodation can not exist. The proper centering of the lens in its relation to the cornea, likewise in how far the axis of the lens and the cornea coincide, will be dependent on the above fact. The visual axis is greatly in?uenced by the position of the lens in the eye.