What is the sclera?

The sclera is the tough, white outer layer of the eyeball, providing structural support and protection to the internal components of the eye. It plays a critical role in maintaining the shape of the eye and serving as an attachment point for the eye muscles, which are essential for movement and focus. The sclera covers most of the surface of the eyeball, except for the part over the cornea, which is the clear, front portion of the eye that allows light to enter.

Understanding the sclera's function helps in recognizing its importance in overall ocular health and its involvement in various eye conditions. For instance, changes in the sclera can indicate systemic diseases or localized eye issues, making it a key structure in both visual function and medical diagnosis.