Dr. Keith Barclay Mercer specializes in ophthalmology in Grass Valley area. Dr. Keith Barclay Mercer, MD has a medical practice at 400 Sierra College Drive, Suite A, Grass Valley CA, and has over 40 years of experience in the field of medicine. He graduated from University Of California, Irvine, California College Of Medicine with his medical degree in 1977. He is affiliated with numerous hospitals, including Sierra Nevada Memorial Hospital (CA) and more. Dr. Mercer is accepting new patients at his medical office and practice location in Grass Valley, California. He is available for appointments, preventative care, medical care as well as ongoing patient care.