What is Cornea? The cornea, together with the sclera, protects against dust, bacteria, as well as other pollutants that could damage the human eye's sensitive components. The cornea additionally filters out certain UV rays from the sun. Also, the cornea is however important for our eyesight. Light rays pass and are refracted by the cornea's curved outer shape. This curved outer layer influences the human capacity to concentrate on things that are placed near as well as objects at a far distance. The cornea of the human eye consists of three parts: The epithelium - The epithelium, the cornea's highest superficial layer, prevents foreign particles to enter the eye. Tears supply oxygen and other nutrients to this layer. The stroma – The stroma, which is present behind the epithelium, is just the thickest layer present in the cornea. It is largely composed of proteins and water, which gives it a flexible but substantial structure. The endothelium can be described as a thin m...