How many tunics make up the structure of the eye?

The structure of the eye is composed of three tunics, which are distinct layers that serve different functions. These tunics are:

1. Fibrous Tunic: This is the outermost layer of the eye and includes the sclera (the white part of the eye) and the cornea (the transparent covering at the front). This tunic provides structural support and protection to the internal components of the eye.

2. Vascular Tunic (Uvea): The middle layer contains the choroid, ciliary body, and iris. The vascular tunic is richly supplied with blood vessels and is responsible for nourishing the eye. It also plays a vital role in regulating light entering the eye through the iris and controlling the shape of the lens for focusing.

3. Nervous Tunic (Retina): The innermost layer consists of the retina, which contains photoreceptors (rods and cones) that detect light and convert it into neural signals for the brain. The retina is crucial for vision, as it enables the process of visual perception.

Understanding the tunics of the eye is essential in comprehending how the eye functions as an organ and its role in the visual system. The correct option