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effects on intraocular pressure and indirectly on vision. The iris along with the anterior ciliary body provide a secondary pathway for aqueous humour to drain from the eye.The iris is divided into two major regions:
# The pupillary zone is the inner region whose edge forms the boundary of the pupil.
# The ciliary zone is the rest of the iris that extends to its origin at the ciliary body.The collarette is the thickest region of the iris, separating the pupillary portion

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