Final answer:
The fibrous tunic of the eye comprises the sclera and the cornea, which serve to protect the eye and allow light entry, respectively. The fovea is the central region of the retina responsible for sharp vision.
Step-by-step explanation:
The fibrous tunic contains two areas: the sclera and the cornea. The sclera, also known as the "white of the eye," is a tough, opaque tissue that protects the eye and provides attachment for the ocular muscles. It accounts for five-sixths of the eye surface but is mostly not visible.
The cornea, on the other hand, is a transparent tissue that covers the front of the eye, allowing light to enter. It is composed of connective tissue with epithelia, and unlike the sclera, it has collagen and elastic fibers but less vascularization.
The fovea is a specialized region in the eye located at the exact center of the retina, known for its high visual acuity. It is the thinnest part of the retina, where only photoreceptors are present, allowing for detailed central vision.