What is the function of Iris, cornea ,crystalline lens, cornea,ciliary

1.	What is the function of Iris, cornea ,crystalline lens, cornea,ciliary muscles
Answer» Thnx Cornea;It is a transparent membrane on the front portion of the eyeball through which light enters the eyeIris: it is a opac circular diagram that control the size of the pupilCiliary muscles: it adjusted the size of the focal length

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