Thomas, Mayer & Associés (TMA) advised the biotech firm O&O mdc, an engineering company in ophthalmic medical devices, specialising in Intraoculair Lenses(IOL) and viscoelastic manufacturing, research into new technologies and project development, in the sale of its business to He Vision Group, 何氏眼保健体系, a group of companies specialized in comprehensive eye care system including eye specialists hospital, vision centres, university, research industry centre.