Dr. John S Mastroni specializes in ophthalmology in Eureka area. Dr. John S Mastroni has a medical practice at 2840 O'neil Lane, Eureka CA, and has over 28 years of experience in the field of medicine. He graduated from Creighton University School Of Medicine with his medical degree in 1989. He is affiliated with numerous hospitals, including St Joseph Hospital (CA) and more. Dr. Mastroni is accepting new patients at his medical office and practice location in Eureka, California. He is available for appointments, preventative care, medical care as well as ongoing patient care.