Dr. David A. Swearingen, O.D.

Dr. David Swearingen received his optometry degree from Southern California College of Optometry in 2000. The National Board of Optometry certified him in Treatment and Management of Ocular Disease in 2000. His undergraduate degree, Physical Education/Pre-Physical Therapy, was received from Point Loma Nazarene University in 1993.

Dr. Swearingen established Spectrum Eyecare Optometry, Inc. in 2006. His professional affiliations include the American Optometric Association, the California Optometric Association, the Fellowship of Christian Optometrists, the National Glaucoma Society and the San Gabriel Optometric Society. He is currently board eligible as a Diplomat of the American Board of Optometry.

Three children have blessed his life: Ashley, Cade and Dawson. He has been married to their mother Amy for 20 years. He enjoys baseball, wakeboarding, jet skiing and golf.


Dr. Melissa Zhao, O.D.

Dr. Melissa Zhao was born and raised in the US territory of Guam. She attended Santa Clara University where she graduated with a B.S. in Biochemistry and received her doctorate from Southern California College of Optometry with honors. Dr. Zhao is a member of the California Optometric Association, American Optometric Association, and the Orange County Optometric Association. In addition to being a licensed optometrist, she is licensed to treat/manage glaucoma, as well as in the use of therapeutic and diagnostic pharmaceutical agents.

Dr. Zhao did her internships at the US Naval Hospital in Yokosuka, Japan, VA Hospital in Las Vegas, Nevada, and in the Indian Health Reservation in Bloomfield, New Mexico. In addition to working in private practice, she also performs eye examinations in skilled nursing facilities in and around Orange County.

In her spare time, she likes to play the cook, play board games, and discover new restaurants.


Dr. Julie Lam, O.D.

Dr. Julie Lam is a Southern California native, born and raised in Orange County. She was fascinated with eyes at an early age, which cultivated her desire to pursue a career in optometry. She earned her bachelor’s degree in Art History with a minor in Biological Sciences at the University of California Irvine, and received her doctorate from the Southern California College of Optometry at Marshall B. Ketchum University. Her clinical training took place at the University Eye Center at Los Angeles, the VA Southern Nevada Hospital, and Hoopes Vision in Salt Lake City. As a licensed optometrist, Dr. Lam is certified to treat and manage glaucoma as well as ocular disease.

Dr. Lam cherishes her career as it allows her to build relationships with her patients. Along with working at Spectrum Eyecare, she performs eye exams at skilled nursing homes and rehabilitation centers across Southern California.

Outside of the office, Dr. Lam enjoys being in the kitchen, going to sporting events, yoga, burning calories at Orangetheory, and spending time with her husband and family.


Shannon, Practice Manager

Shannon graduated from Cal Poly Pomona with a Bachelors degree in Psychology and has over 18 years of experience in the optical field.  Her vast knowledge allows patients to feel very secure in knowing that they are getting the best products and service.  She knows style and fashion and can help you find the right product while keeping within your own personal style. Or if you’ve been thinking about LASIK or refractive surgery she can answer all your questions and set you up with a free consultation at NVision Laser Eye Centers if you would like.

She enjoys dancing, cooking and relaxing at the beach with her husband, and their three children.


April Buss,  Assistant Manager

April brings 18 years of invaluable optical experience to our Spectrum Eyecare Optometry family. Her vast knowledge of optical lenses, and premium products are a wonderful asset to all of our patients. April also assists our doctors in performing technical procedures during your exam. Her eagerness to continue learning helps keep our team moving towards the future of eyecare. She is always happy to help make each and every one of our patients have the best experience possible.


Meagan Prendergast, Lead Optical Coordinator

Meagan brings 17 years of excellence in optical experience to each person in the Spectrum Eyecare Optometry patient family. Her outgoing personality, enthusiasm and wealth of knowledge are an asset for our team and your care here! She has a passion for helping children with visual functional challenges using Vision Therapy treatment, and enjoys helping patients choose the most attractive and stylish frames. Meagan never forgets a name or a face, so she will always make you feel like you’re a part of our family.


Corey Wellington, Office Coordinator

Corey is newer to optometry but not new to customer service.  Corey makes her priority to ensure all patients are greeted with a kind “Hello” and will do anything assist them in any way necessary.  Corey’s kind disposition is infectious and helps ensure all our patients are well taken care of.