Ace the Certified Ophthalmic Assistant Exam 2025 – Eye-Opening Success Awaits!

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The thickest layer of the cornea is called the

stroma

The thickest layer of the cornea is called the stroma. The cornea is made up of five layers: epithelium, Bowman's layer, stroma, Descemet's membrane, and endothelium. The stroma is the middle and thickest layer of the cornea, comprising about 90% of its thickness. It is primarily made up of collagen fibers arranged in a specific way to maintain transparency and strength in the cornea.

The other options are incorrect because:

- Canthi are the corners of the eye where the upper and lower eyelids meet; they are not a layer of the cornea.

- Aqueous humor is the clear fluid filling the space in the front of the eye, behind the cornea and in front of the lens; it is not a layer of the cornea.

- The iris is the colored part of the eye that controls the size of the pupil and the amount of light entering the eye; it is not a layer of the cornea.

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canthi

aquous humor

iris

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