Sclera Sclera The sclera, also known as the white of the eye, is the opaque, fibrous, protective, outer layer of the human eye containing mainly collagen and some elastic fiber. In humans, the whole sclera is white, contrasting with the coloured iris, but in other mammals the visible part of the sclera matches the colour of the iris, so the white part does not normally show. In the development of the embryo, the sclera is derived from the neural crest. In children, it is thinner and shows some of the underlying pigment, appearing slightly blue. In the elderly, fatty deposits on
The Eye of the Giant wasteland as the Constitution begins to warp into a monstrous living being. The contents of the ampoule have merged Nancy, Brokk's eye, and the organic components of the ship itself into a voracious living entity, part animal, part vegetable, and part mineral; the transition has driven the new entity insane, and it will consume all life on Earth. The Doctor is unable to fight this new life form, and when Liz and Osgood try to cut it to pieces using the time bridge, the pieces reconstitute on the other side and attack them. They are forced to flee beyond the