silmänvalkuaisia

Silmänvalkuaisia refers to the white part of the eye, scientifically known as the sclera. It is the tough, fibrous outer layer that covers the majority of the eyeball, providing structural support and protection. The sclera is mostly composed of collagen fibers, which give it its white appearance and strength. Its primary function is to maintain the shape of the eye and to anchor the muscles that control eye movement.

Blood vessels are visible on the surface of the sclera, particularly when the eye is irritated or inflamed. These vessels can appear red, making the white of the eye look bloodshot. Conditions affecting the sclera can range from minor irritations like conjunctivitis (pink eye) to more serious conditions such as scleritis, an inflammation of the sclera that can cause significant pain and vision impairment. The sclera is continuous with the cornea at the front of the eye, which is the transparent outer layer that covers the iris and pupil. While the sclera is opaque, the cornea is clear to allow light to enter the eye. In summary, silmänvalkuaisia, or the sclera, is a vital protective and structural component of the human eye.