What does the cornea do?

Question

BlackTom AI · Accepted Answer

When evaluating what the cornea does, it helps to recall the basic structure and function of the eye.
Option 1: 'It sends electrical signals to the optic nerve.' This is incorrect because the cornea itself is a transparent front layer that primarily serves as a window for light entry; it does not generate or send electrical signals. The signals originate from retinal cells after light is focused by the lens.
Option 2: 'It protects the lens of the eye.' This is correct. The cornea forms part of the outer protective layer of the eye and helps shield inner structures, including the lens, from dust, debris, and injury, while also helping to focus light onto the retina.
Option 3: 'It relays information from the optic nerve to the brain.' This is inaccurate. The relay of visual information from the eye to the brain occurs via the optic nerve, not through the cornea. The cornea does not act as a neural pathway.
Option 4: 'It contains rods and cones to detect color.' This is a misconception. Rods and cones are photoreceptor cells located in the retina behind the cornea; the cornea itself contains no photoreceptors and does not detect color.
In summary, the cornea’s primary role among the options is protective and as part of the initial light-focusing surface, aligning with option 2.

What does the cornea do?

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