What is the main characteristic of the sclera in the eye?

The main characteristic of the sclera is that it is a tough, white fibrous tissue. This outer layer of the eye provides structural support and protection for the inner components of the eye, ensuring that the delicate parts are safeguarded from injury. Its tough composition also assists in maintaining the shape of the eye, which is essential for proper vision.

The sclera's white appearance is due to the collagen fibers that make up its structure, contributing to its strength. Unlike the other layers or components of the eye, such as the retina (which is light-sensitive), the iris (which is the colored part of the eye), or the aqueous humor (the watery fluid), the sclera mainly serves to protect and maintain the integrity of the eye rather than participating actively in vision or light perception.