The term 'eyeball covers' refers to two parts of the eye: the sclera and the LIDS. The sclera is the white part of the eye, which is a tough, fibrous layer that protects the inner structures of the eye. The LIDS are the thin, movable folds of skin that cover and protect the eyes. Together, the sclera and the LIDS form the eyeball covers, which protect the eyes from dust, dirt, and other foreign objects.