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Meet Our Doctors


Dr. Irene M. Lin-Dilorinzo, Optometrist and Founder

Dr. Irene M. Lin-Dilorinzo has over 28 years of experience as an optometrist.  

In 1987, Dr. Lin completed her undergraduate education at California State Polytechnic University Pomona, earning a Bachelor of Science Degree with Magna Cum Laude honors.  She majored in Biological Sciences and minored in Zoological Sciences.

In 1992, Dr. Lin graduated from the accredited Southern California College of Optometry with a Doctor of Optometry degree. Her research was in Sports Vision and she did an externship at Fort Ord Army Hospital in Monterey, California as well as a family care externship at Baldwin Park Optometric Center in San Gabriel Valley, California.

During the first eight years of her career as a clinical optometrist for a multi-specialty medical group, Dr. Lin examined patients alongside other optometrists, ophthalmologists and a vast array of physicians, from pediatricians to OB/Gyns to Internists. Her work experience in a team setting continues to influence Dr. Lin to take care of the whole person, not just their eyes.  She then became an Independent Doctor in a corporate setting while also working part time for various private practices in the Los Angeles and San Gabriel Valley areas. Her career journey could end there. However, her dream was to own her own private practice. Monarch Bay Optometry was founded in 2004.

Dr. Lin is married to Robert and loves to rescue dogs from the local animal shelter or rescue. She currently has one senior dog named Bugsy.


New Partnership

Dear Patients:

I am excited to announce that after years of solo practice, I have decided to partner with a group of doctors led by Dr. Kristine Kobayashi and Dr. Anna Pennino.  Together, we will lead our practice to new heights and we welcome you to come along for the adventure.  I take this opportunity to personally thank you in advance for your kind support of our new professional partnership.


Dr. Irene M. Lin-Dilorinzo


Dr. Kristine M. Kobayashi, Optometrist

Dr. Kristine Kobayashi has been my friend since 1999. She has an outgoing personality and warm nature. In addition, her excellent clinical skills have impressed me for over 20 years. 

Dr. Kobayashi, O.D. completed her undergraduate studies at the University of California, Santa Barbara. She then earned her Doctor of Optometry degree from the Southern California College of Optometry. Dr. Kobayashi has specialized training in Low Vision and hospital-based optometry.  She obtained her license to utilize pharmaceutical agents in the state of California in 1997.

Dr. Kobayashi is married to Randy and has two beautiful children.  She enjoys traveling and fine dining.


Dr. Anna M. Pennino, Optometrist

Dr. Anna Pennino, O.D. received her baccalaureate degree from California State University at Fullerton. She earned her Doctor of Optometry degree from New England College of Optometry Boston, Massachusetts in 1991. Post-doctorate, Dr. Pennino participated in clinical research, evaluating the ocular side-effects of cholesterol-lowering medication. She is a native Californian practicing in her two locations; Del Rey Optometry, Playa Del Rey (2002) and South Gate Optometry, South Gate (2007). "I am committed to delivering personalized patient care. I do my best to connect with each patient to solve their visual needs while educating and giving everyone a reason to smile." Her professional interests are primary care optometry and specialty contact lenses including multifocal and myopia control. She has been a sponsoring doctor for Unite For Sight, a non-profit organization that empowers communities worldwide to improve eye health and eliminate preventable blindness. She has participated in contact lens solution studies and contact lens consulting.

Dr. Pennino also enjoys expressing her creative side. She is the co-designer of her exclusive eyewear collection Pepper Zagg. In addition to optometry and designing eyewear, Dr. Pennino is an enthusiastic skier, scuba diver, and adventurous traveler. She is an active volunteer at the Orange County Food Bank and Kinetic Academy Charter School, founded by her husband.She can’t resist an ice-cold diet coke and believes the best medicine is a good laugh.

Dr. Pennino is married to an ambitious banker, and is a mom of two sets of twin boys! In her spare time when she is not chauffeuring her boys to their various activities, she looks forward to relaxing with her husband and a glass of red wine.