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Corena- This acts as the eye's most outermost lens, it controls and focuses the entry of light.
www.masseyeandear.org/for-patients/patient-guide/patient...and.../cornea/function

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The pupil is the opening in the centre of the iris. The size of the pupil determines the amount of light that enters the eye.

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The white outer layer of the eye ball. Form the supporting wall of the eye.

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The lens is a transparent structure behind the iris, the coloured part of the eye. The lens bends light rays so that they form a clear image at the back of the eye – on the retina. As the lens is elastic, it can change shape, getting fatter to focus close objects and thinner for distant objects.

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The iris is in the front of the eye. It sits between the crystalline lens and the cornea. It contolls the the amount of light that is let in andout of the eye.if this is damaged you can have tiny holes in your eyes to let in more light .

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Controls the shape of the lense when you focus of something

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Iris:
The iris is located in front of the lens and ciliary body and behind the cornea.
I can dilate(expand) and contract to control the size of the eye.
Choroid:
The choroid, also known as the choroidea or choroidcoat, is the vascular layer of the eye, containing connective tissue, and lying between the retina and the sclera.

http://www.medicinenet.com/image-collection/eye_anatomy_detail_picture/picture.htm

https://www.britannica.com/science/iris-eye

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Lacks VIsual Receptors

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the pupil allows light to hit the retina.

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creates a blind spot

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Orbital anterior segment, a circle of fibrous tissue holds it in place.
Allows focus on objects at variable differences.
Sclera

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transfer visual information from the retina to the vision centers of the brain via electrical impulses

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Retina- Thin layer of tissue that lines the back of the eye. It receives light that the lens has focused, then converts the light into signals and send it to the brain for visual recognition.

healthline.com

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In the eye, a tiny pit located in the macula of the retina that provides the clearest vision of all. Only in the fovea are the layers of the retina spread aside to let light fall directly on the cones, the cells that give the sharpest image.

extra info The word "fovea" is the Latin word for "small pit." The fovea is literally a small depression (in the retina).