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Our Eye Doctors

Eye 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 take 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:

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Dr. Amanda Ibarra Ranola, O.D.

Dr. Amanda Ranola received her B.A. in Molecular Cell Biology, with an emphasis on Cell Developmental Biology, from University of California Berkeley. She earned her Doctor of Optometry degree from Southern California College of Optometry, where she graduated as Magna Cum Laude. Dr. Ranola received comprehensive training in Primary Eye Care, Contact Lenses, Pediatrics, Ocular Disease, Red Eye Emergencies, Low Vision, and Vision Therapy during her rotations at VA Los Angeles Ambulatory Care Center, Optometric Center of Los Angeles, Pediatrics & Vision Therapy in Irvine, CA, and Ketchum Health University Eye Center.

She has lived in Antioch since she was 3 years old, and recounts watching the city grow with her. Dr. Ranola is very involved with her church, Church of Christ, and has been very active since she was young. She’s been a Choir Member, Sunday School Teacher and a Choir Leader, and has planned activities for the youth group from 12 years old until she was married. Currently, she and her husband lead the married couples organization in her church for Northern California. Dr. Ranola also leads vision screenings all around Northern California- gathering optometrists to help give free reading glasses and visual acuity testing. In her spare time, Dr. Ranola enjoys singing, drawing, running, and planning events.

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Dr. Estella Sim, O.D.

Dr. Estella Sim was born and raised in the bay area. She then attended the University of California, Los Angeles to receive a B.S. in Psychobiology and a minor in Asian American Studies. She completed her Doctorate of Optometry at the University of California, Berkeley. She received extensive clinical training in primary care and ocular disease during her rotations at the Fresno and Livermore Veterans’ Affairs hospitals and Vandenberg Air Force Base.

During her spare time, Dr. Sim loves to cook, spend time with family and friends, and try delicious cuisines and restaurants!