Menicon of Japan purchased Sequoia in 1989. As president of Menicon USA, Bill continued his specialty lens design and consulting.
Carter Contact Lens established itself in 1997. Menicon ceased RGP manufacturing in the USA a few years later. New lens designs for multifocal and keratoconus helped fitting specialists to fullfill patient needs. CCL Crescent Bifocal and Trifocal lenses provide exceptional distance and near vision. The CarterKone decenters the optic zone to match the contour of the cornea for better centration and vision.