Which structure of the eye is described as a clear membrane that protects the eye?

The structure described as a clear membrane that protects the eye is the cornea. The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. Its clear nature allows light to enter the eye while also providing a significant portion of the eye's total optical power. The cornea plays a crucial role in focusing the light that enters the eye in conjunction with the lens.

By acting as a barrier, the cornea protects the internal structures of the eye from dust, debris, and microorganisms. It also helps maintain the shape of the eye and is vital for clear vision. The protective aspect of the cornea is essential for overall eye health, as any damage or disease affecting this membrane can significantly impact vision and the eye's ability to function properly.