Process for preparing a hydrophobic acrylic polymer material for the production of an implantable ophthalmic device, which process includes at least: a) a step of providing a mixture of at least an aromatic acrylate monomer, an aromatic methacrylate monomer and an alkoxyalkyl methacrylate monomer; b) a step of degassing the mixture obtained in step a); c) a step of introducing said mixture into an intraocular lens mould; d) a step of thermally induced free radical polymerization in the presence of an initiator; e) a step of polymerization by irradiation with gamma rays.