Z
Zeis, glands of See glands of Zeis.
zinc sulphate An astringent and antiseptic agent sometimes used topically in solution 0.2% or 0.25%, to clear mucus from the outer surface of the eye (by precipitating proteins), to give temporary relief of minor eye infections, and to treat some types of bacterial conjunctivitis.
Zinn, annulus of See annulus of Zinn.
Zinn, circle of See circle of Zinn.
Zinn, zonule of A series of fibres passing from the ciliary body to the capsule of the lens at or near its equator, holding the lens in position and enabling the ciliary muscles to act upon it. The lens and zonule form a diaphragm that divides the eye into a small anterior area, which contains aqueous humour, and a larger posterior area, which contains vitreous humour. The zonule forms a ring that is roughly triangular in a meridional section. It is made up of fibres that are transparent and straight for the most part. The tension of these fibres varies with the state of contraction of the ciliary muscle and thus affects the convexity of the lens. The zonule of Zinn is made up of many non-cellular fibres, the fibrils of which consist of a cysteine-rich microfibrillar component of the elastic system, fibrillin. The fibres have been classified as follows: (1) The hyaloid zonule (orbiculo-posterior capsular fibres
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