For the 13th edition of the Nice Classification, "eyeglasses," "spectacles," "sunglasses," and "contact lenses" were transferred from Class 9 to Class 10. These goods are used to correct eyesight or to protect the health of the eye and as such they function as "medical...apparatus, instruments and articles generally used for the...treatment or improvement of function or condition of persons" consistent with the Class 10 Explanatory Note.