Which eye structure is a transparent, colorless protective tissue?

Which eye structure is a transparent, colorless protective tissue?

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

Answer: (D)

The front surface of the eye that stays clear and acts as a protective window is the cornea. It is transparent and colorless, forming the outermost front layer that covers the iris and pupil. Its clear nature lets light enter with minimal scattering, and its curved surface also helps focus light onto the retina. The other structures mentioned have different roles or appearances: the iris is the colored part that controls how much light enters, the pupil is the opening in the iris, and the retina is a light-sensitive layer at the back of the eye. So the cornea fits the description of a transparent, colorless protective tissue.

The front surface of the eye that stays clear and acts as a protective window is the cornea. It is transparent and colorless, forming the outermost front layer that covers the iris and pupil. Its clear nature lets light enter with minimal scattering, and its curved surface also helps focus light onto the retina. The other structures mentioned have different roles or appearances: the iris is the colored part that controls how much light enters, the pupil is the opening in the iris, and the retina is a light-sensitive layer at the back of the eye. So the cornea fits the description of a transparent, colorless protective tissue.