Which structure acts as a protective barrier to the iris and pupil?

Which structure acts as a protective barrier to the iris and pupil?

• A. Cornea
• B. Sclera
• C. Iris
• D. Retina

Answer: (A)

The cornea is the protective barrier in front of the eye. It’s the clear, outermost front surface that shields the iris and pupil from dust, germs, and injury, while also letting light into the eye to begin the focusing process. The iris sits just behind this front window and controls how much light reaches the pupil, which is further inside. The retina lies at the back of the eye, processing the light that comes through. While the sclera also protects the eye, it forms the outer white layer and doesn’t serve as the front barrier for iris and pupil in the way the cornea does.

The cornea is the protective barrier in front of the eye. It’s the clear, outermost front surface that shields the iris and pupil from dust, germs, and injury, while also letting light into the eye to begin the focusing process. The iris sits just behind this front window and controls how much light reaches the pupil, which is further inside. The retina lies at the back of the eye, processing the light that comes through. While the sclera also protects the eye, it forms the outer white layer and doesn’t serve as the front barrier for iris and pupil in the way the cornea does.