(858) 675-2020

Mon - Tues: 9:30 am - 6:30 pm 
Wed - Fri: 8 am- 6:30 pm 
Sat: 9 am - 2 pm

Extended hours by appointment only:
Thursday: 6:30 pm - 8 pm


Meet Our Doctors

Natalie Li, O.D.

Dr. Li graduated from USC in 1997 with a degree in Physiology. She earned her doctorate from Illinois College of Optometry in 2002. She participates in laser refractive surgery co-management and post refractive surgical care, fitting of specialty contact lens, and management of eye diseases for patients. Dr. Li has therapeutic privileges to prescribe topical ocular medications. Dr. Li is a proud member of the 4S Ranch Foundation and a local mother of 2 in the 4S community.

Keith Wan, O.D.

Dr. Wan graduated from UCLA in 1993 with a degree in Physiological Sciences. He then earned his doctorate in Optometry from UC Berkeley. He has a clinical interest in fitting contact lenses and medically indicated contact lenses for conditions such as keratoconus, high myopia, high astigmatism, and anisometropia. Dr. Wan also has an emphasis for the treatment of ocular disease, such as corneal diseases and diabetic retinopathy. Therapeutic privileges are utilized with the ability to prescribe topical steroids, antibiotics, and systemic medications. He also participates in laser refractive surgery co-management and post refractive surgical care for patients. Dr. Wan was named America's Top Optometrist for 2006 and 2007 by the Consumers Research Council of America.

Jay Mashouf, O.D.

Dr. Mashouf graduated from UCSD in 1992 with a B.A. in Chemistry. A year later he decided to return to school and earned his doctorate from the UC Berkeley in Optometry. He participates in laser refractive surgery co-management and post refractive surgical care, the management of eye disease, the fitting of specialty contact lenses, and sports vision for patients. San Diego Magazine recently named him one of San Diego's Top Doctors for 2006, the second consecutive year he has been so honored. Dr. Mashouf resides in Poway with his wife and two young sons.

William Harpur, O.D.

Dr. Harpur received his degree in Optometry from UC Berkeley in 1982. Since then he has practiced full-time in San Diego. He has been emphasizing preventive Optometry and using vision therapy and phototherapy in his practice since 1989. He became associated with 4S Eyecare/ Scripps Poway Eyecare and Optometry in 2004 with his emphasis in Developmental Optometry. He has completed extensive continuing education in Vision Therapy since graduation from Optometry School and is a member of the American Optometric Association, The College Of Optometrists in Vision Development, and the College Of Syntonic (Phototherapeutic) Optometry. He lives in Clairemont (San Diego) with his wife of 34 years. They have two college-age daughters.

Ngoc Nguyen, O.D.

Dr. Nguyen graduated from UCSD in 1989 with a B.A. in Biology. She spent the next year and a half at UCSD Medical School doing research and co-authoring papers on senescence and oncology gene therapy. When project funding became an issue, she decided to fulfill her longtime goal of becoming an optometrist. She returned to school and earned her doctorate from UC Berkeley School of Optometry in 1995. She has been in practice since then; joining 4S Eyecare and Optometry in 2007. She has an emphasis in fitting specialty contact lenses, including bifocal, keratoconic, and anisometropia. Therapeutic privileges are utilized with the ability to prescribe topical antibiotics, anti-allergenic, anti-inflammatory, and other ocular and systemic medications. Dr. Nguyen also served as a Board member of the San Diego County Optometric Society. She currently resides in Carmel Mountain with her husband and two young children.

Melissa Bersamina, O.D., M.B.A.

Dr. Bersamina earned a bachelor of science in Biological Sciences with an emphasis in Neurobiology, Physiology, and Behavior from the University of California at Davis in 2003. She earned her doctorate from the Southern California College of Optometry in 2008 and is certified in the treatment and management of ocular diseases. As a recipient of the Navy Health Professionals Scholarship, she was commissioned as a U.S. naval officer and completed military training in Newport, Rhode Island. She then served for over 4 years as an active duty Navy optometrist, providing care to the members of our armed forces and their dependents, both on land and aboard the USS Nimitz and USS Makin Island. During her time in the Navy, she had the pleasure of teaching and mentoring students as clinical faculty for a number of optometry schools. She enjoys providing care to LASIK patients and had surgery herself in 2007. Dr. Bersamina also has earned her Master of Business Administration from UCLA's Anderson School of Management..