The invention relates to eyeglasses comprising two lens units (1) that are fitted with a device for keeping the eyeglasses on a wearer's head, further comprising a nose bridge (5) that connects the two units and includes a central portion (5a) to be disposed about the wearer's nose； at least one of the units is provided with a duct (7) inside which a lateral portion (5b) of the nose bridge (5) is slidingly mounted by means of a mechanism for adjusting the position of the lens unit relative to the nose bridge, said adjusting mechanism comprising a member (8) that is rotatably mounted in the duct (7)； said member and the lateral portion (5b) of the nose bridge (5) comprise coupling means (9, 10) designed to convert the rotation of the member into a relative translational movement between the lateral portion and the duct.
