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Our Doctors & Staff

primarycareEye care professionals specialize in understanding how the human eye really works, as well as diseases and conditions that affect your vision - many of which do not have obvious symptoms. Eye doctors know how age and risk factors affect vision over time for young and old, and they understand the benefits and features of corrective lenses including eyeglasses and contacts.

Our optometrists and staff serve Castro Valley and Cherryland, taking the time to explain the results of your eye exam, describe your options and listen to your eye care needs. Because maintaining good eye health is an ongoing partnership, we encourage you to ask questions and share your health information, which could be vital to monitoring, diagnosing and treating potential vision problems.

Meet our doctors and staff:


Dr. Gary Osias

Dr. Gary Osias has practiced Optometry for over 30 years, having received his undergraduate degrees in Psychology and Visual Science, and his Doctor of Optometry from the University of California, Berkeley. In 1985, Dr. Osias acquired San Lorenzo Optometry Group from his father, Dr. Leonard Osias. As the practice grew...

Dr. Marc Dea

Dr. Marc Dea received his undergraduate degree in Biological Sciences from U.C. Davis and his Doctor of Optometry from the U.C. School of Optometry at Berkeley. Before entering private practice, Dr. Dea completed a postgraduate teaching fellowship at U.C. Berkeley. Dr. Dea’s professional philosophy includes forward thinking, preventative care, and...

Dr. Kathy Alcid

Dr. Kathy Alcid is an optometrist serving the Bay Area. She received her B.S. in Biology at the University of California, Los Angeles, and earned her Doctorate of Optometry from the University of California, Berkeley. Additionally, Dr. Alcid completed a residency in low vision at the Center for the Partially...

Dr. Helen Xue

Dr. Helen Xue grew up on the East Coast, and then moved to the Bay Area to receive her Bachelor degree in Chemical Biology from the University of California. She then attended the UC Berkeley School of Optometry to receive her Doctorate of Optometry, where her clinical training included primary...

Lydia Phillips, Business Manager

Lydia Phillips has over 30 years of experience in optometric management and is a Certified Office Manager. She has taught classes in Medicare claim procedures, Managed Care evaluation, and Office Information Systems for a large practice management group, as well as procedural training for a clinical contact lens study. As...