An article of manufacture comprises a copolymer of ethylene and vinyl aromatic monomer having a molecular weight of less than 15,000. The light-emitting element further includes a first electrical-contact region located on the first region, and a second electrical-contact region located on the second semiconductor layer, wherein the lateral resistance of the second semiconductor layer is larger than that of the first semiconductor layer. Defined on a mounting surface of the first base are: a first region having a surface contacting with a mounted substrate; a purge groove provided in the portion covered with the substrate and surrounds the first region; and a second region having a surface surrounding the purge groove. The acceleration limit may be further adaptively controlled based on an approach of a vehicle trim limit. The method can also be used in conjunction with another therapeutic agent or adjunctive therapy commonly used to treat glaucoma to enhance the therapeutic effect of reducing the intraocular pressure. Such device overcomes the frequent problems concerning the space available for installing gimbal adapters.