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Why is iodine considered a trace element, and what is its biological function in humans?
Cornea
The clear, transparent front covering of the eye that allows light to enter and contributes to the eye's focusing power.
Protective Coating
A layer of material applied to objects or surfaces to guard against damage or corrosion.
Fovea
A small depression in the retina of the eye where visual acuity is highest, containing a high concentration of cones for daytime vision.
Sclera
The white outer layer of the eyeball, providing protection and form.
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