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About St. Joseph Health

SJH provides a full range of care facilities including 16 acute care hospitals, home health agencies, hospice care, outpatient services, skilled nursing facilities, community clinics and physician groups. All of our hospital and home health entities are accredited by the Joint Commission. In our award-winning facilities, SJH maintains a "continuum of care," matched to the diverse needs of the urban centers, smaller cities and rural communities who depend on us every day.

William Mosier, MD

  • Comprehensive Ophthalmology
    (Board Certified)
Additional Language Spoken
Medical Groups & Affiliations
  • St. Jude Affiliated Physician
  • St. Jude Heritage Medical Group
Mosier Eye Center
265 Laguna Road
Fullerton, CA 92835
Accepting New Patients

Primary Office

Mosier Eye Center
265 Laguna Road
Fullerton, CA 92835
Get Directions
(714) 871-2570
(714) 441-2020

More Information

  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Comprehensive Ophthalmology
      (Board Certified)
    Education & Training
    • Medical School
      Facultad De Ciencas De La Salud
    • Internship
      Department VA Medical Center-LongBeach
    • Residency
      UCI Medical Center
  • Biography


    Dr. Mosier is a board certified ophthalmologist specializing in Comprehensive Ophthalmology. He is an accomplished and highly skilled cataract and anterior segment eye surgeon with extensive experience in the diagnosis and treatment of eye diseases.

    Dr. Mosier completed his residency in Ophthalmology at the University of California, Irvine School of Medicine. He is a former Associate Clinical Professor of Ophthalmology at the University of California, Irvine and is the founder and medical director of the Mosier Eye Center Medical Group in Fullerton, California.

    Dr. Mosier is a Fellow of the American Academy of Ophthalmology and a member of the American Society of Cataract and Refractive Surgery, California Association of Ophthalmology, California Medical Association, Orange County Medical Association, and the Orange County Society of Ophthalmology. He has been an active member of the medical staff at St. Jude Medical Center, Fullerton for over 25 years.

    Dr. Mosier and his staff are committed to providing his patients with only the highest quality medical and surgical eye care, and vision care. His golden rule has always been to “treat my patients as I would expect to be treated”. Dr. Mosier has contributed to the Southern California community in many ways throughout his career and has been recognized by the California State Senate and Orange County Board of Supervisors for his volunteerism in providing charitable specialty care services to medically indigent residents in Orange County.

    Dr. Mosier is married to his wife of over 38 years, has three children, and two grandchildren. He enjoys the outdoors- camping, hiking, and fishing- as well as, gardening and cooking.