Nanovox (also known as Vadient Optics) is a developer of printable gradient index (GRIN) optical materials. It offers the VIRGO lens technology that uses 3D printing of custom-tailored nanocomposite materials to contour the refractive index within the lens itself. VIRGO can be used in monolithic achromatic lenses, progressive eyeglass lenses, flat aspheric imaging optics, freeform refractive optics and phase plates, chirped, anamorphic, and compound microlens arrays, and other solutions.