What three components make up the fibrous tunic of the eye?

The fibrous tunic of the eye is primarily composed of the sclera, cornea, and limbus. The sclera is the white outer layer of the eye, providing structure and protection. The cornea is the transparent front part of the eye that covers the iris and pupil and is crucial for focusing light. The limbus is the border area between the sclera and the cornea and plays a pivotal role in the health of the eye by providing a source of stem cells for corneal regeneration.

Together, these three components serve not only as a protective layer but also contribute to the overall function of the eye in terms of light entry and focus. This understanding is vital, as it highlights the structural importance of these components in maintaining vision and eye health. The other combinations involving the retina, iris, and pupil do not accurately reflect the components of the fibrous tunic.