By Malathi Nayak SAN FRANCISCO (Reuters) – The startup Oculus VR has raised $75 million to market its virtual-reality headset for video games, hoping to attract consumers who have shied away from such products in the past. Irvine, California-based Oculus raised the sum in a round led by Silicon Valley investor Mark Andreessen of venture capital firm Andreessen Horowitz. Oculus plans to use its new capital to produce commercial versions of its virtual reality glasses for video games called Ouclus Rift, which users mount on their heads with a strap. “We believe Oculus will not only alter the gaming landscape but will redefine fundamental human experiences in areas like film, education, architecture, and design,” Andreessen said in a statement.