Advanced, Personalized, High Quality
Medical and Surgical Eye Care

Doctor Mosier and the entire staff are committed to providing you with a superior level of care in a friendly and personalized environment. We are very proud of the long term relationships that we have established with our patients. Our staff at MOSIER EYE CENTER is focused on maintaining your trust and confidence.

We hold ourselves to a high level of excellence in every aspect of our practice. This includes the care we provide, the equipment we use, the health and safety protocols we follow, and the incidental services we offer. Above all, our aim is to provide each of our patients with an optimal experience.


William D. Mosier, M.D.
William D. Mosier, M.D.
Dr. William D. Mosier is a board certified ophthalmologist specializing in Comprehensive Ophthalmology. Dr. Mosier is also a very accomplished and highly skilled cataract and anterior segment eye surgeon with extensive experience in the diagnosis as well as the treatment of eye diseases.

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Mai Pham, M.D.
Mai Pham, M.D.
Dr. Mai Pham is a highly respected, accomplished, board-certified, Comprehensive Ophthalmologist and fellowship-trained Cornea Subspecialist, with extensive training and experience in the medical and surgical treatment of eye disease. As a comprehensive eye physician and surgeon, she diagnoses and treats…

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Dr. Christina Leung, OD
Dr. Christina Leung, OD
Dr. Leung was born and raised in San Francisco but now calls Orange County her home. She earned her Bachelor of Science degree in molecular cell biology from the University of California, Berkley before earning her Doctor of Optometry degree, graduating Beta Sigma Kappa from the Southern California College of Optometry.

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Expert Eye Care

Patients should see their doctor for a comprehensive eye exam every year. Children should have regular tests to ensure the proper development of their vision and prevent any interference with academic achievements. Older adults are often at a higher risk for eye conditions such as glaucoma, macular degeneration and cataracts. Even if eyes are healthy, a regular eye exam will provide the doctor with an ability to view the blood vessels of the eye.

Look around the website to find out more information about:

  • Eye Conditions & Eye Diseases
  • Cataract and Glaucoma
  • Optical Services/ Contact Lenses

Mosier Values

Our goal is to provide superior vision and patient care.
All of our opticians are certified by the American Board of Opticianry (ABOC).
  • To provide the highest-quality lenses possible to our patients.
  • To ensure patient comfort while wearing their glasses.
  • To provide patients with the best vision possible.
  • To give superior eye protection.
Mosier Eye Center will do its very best to meet your eyeglasses or contact lenses needs. Our patients are given a wide selection of eyeglass frames, lenses and contact lenses to choose from in our Optical Shop. A full service lab is available to prepare the lenses for patients while they wait.