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Doctors

Meet the experienced and friendly doctors who make Vista Eye Care a proud provider of vision care products and services in Green Valley.


Christine Bartoletti, OD

Dr. Bartoletti received her undergraduate education at Hamline University in Minnesota. She obtained her Doctor of Optometry degree from Pacific University College of Optometry, graduating with honors. In addition to her optometry college education, she completed a one-year residency program at the Veterans Hospital in Portland, Oregon, receiving specialized training in ocular disease and geriatric care.

Dr. Bartoletti is the founder of Vista Eye Care.  She is a Diplomate of the American Board of Optometry, the Vision Source Administrator for Southern Arizona and serves on a consulting panel for Transitions lenses.  She is also an active member of the American Optometric Association, Arizona Optometric Association and Southern Arizona Optometric Society.

Dr. Bartoletti has provided eye care to Green Valley and Sahuarita residents for almost 20 years. She is a longtime resident of Green Valley and enjoys hiking and traveling during her free time.


Samantha Nogales, OD, FAAO

Dr. Samantha Nogales is an Arizona native born and raised in Tucson.  She is a proud alumni of the University of Arizona and received her doctorate from Southern California College of Optometry where she graduated with honors. She then went on to specialize in ocular disease and low vision by completing a residency at the Southern AZ Veteran’s Administration in Tucson, AZ.

Active in her profession and with an ongoing dedication to provide excellent patient care, Dr. Nogales has published various scientific, ocular disease-related posters and papers, as well as presented continuing education for the local optometry community. She strives to stay current in all aspects of optometric care and attends various optometry and ophthalmology conferences annually. She is licensed by the Arizona Board of Optometry and is a Fellow of the American Academy of Optometry.

Dr. Nogales practices full scope optometric care with emphasis on ocular disease treatment and management including diabetes, macular degeneration and glaucoma. She also provides pre and post-op care for iLASIK and cataract surgery; as well as, routine exams and contact lenses.

She lives in Tucson with her husband and two daughters. She enjoys spending time with her family, hiking with their two dogs, and practicing yoga.


Riley Williamson, OD

Dr. Riley Williamson was born and raised in Alberta, Canada. He attended undergraduate school at Brigham Young University in Utah and graduated with a degree in Neuroscience. He later attended Southern College of Optometry in Memphis, TN. Dr. Williamson received multiple prestigious awards and graduated with Cum Laude Honors in 2012.

Dr. Williamson provides full scope Optometric care including diabetic eye exams, glaucoma treatment, diagnosis and management of cataracts and macular degeneration, treatment of dry eyes and eye infections, and contact lens examinations. He also has a true passion for pediatric eye care, myopia control and ocular nutrition.
Dr. Williamson is an active member of the American Optometric Association, Arizona Optometric Association, Southern Arizona Optometric Society and Ocular Nutrition Society.

He enjoys spending time with his wife and four children exploring the outdoors. When he has free time, he enjoys building naturalistic vivariums for his collection of tropical frogs.


Tayla Meade, OD

Dr. Tayla Meade was born and raised in Ohio where most of her family still resides. She studied Biology at Ohio University and then went on to complete her Doctor of Optometry, graduating with Cum Laude honors from The Ohio State University College of Optometry. Dr. Meade specializes in full scope optometric care, including ocular disease management, contact lens examinations, pre and post-op care for cataract surgery, and pediatric vision care.

Dr. Meade is a member of the Arizona Optometric Association, American Academy of Optometry, and the Southern Arizona Optometric Society. She continues to stay up to date with the latest technology and treatment options.

Although now an Arizona resident, Dr. Meade continues to route for Ohio sports teams, especially Ohio State (Go Bucks!) She enjoys visiting friends and family and being outside, hiking, biking, and playing sand volleyball.


Marcela J. Sierra-Romero, OD

Dr. Marcela Sierra-Romero is an Arizona native, born and raised in Tucson. She is a proud alumnus of the University of Arizona and graduated with a degree in Molecular and Cellular Biology. She discovered her passion for Optometry while working as an Ophthalmic Technician, and decided to pursue her Doctorate of Optometry from Western University of Health Science in Pomona, CA. Dr. Sierra-Romero provides full scope Optometric care including ocular disease management.

Dr. Sierra-Romero is a member of the Southern Arizona Optometric Association, Arizona Optometric Association and the American Academy of Optometry. She continues to stay up to date with the latest technology and treatment options. In her free time, she enjoys spending time with her husband, family, and friends. She especially enjoys rooting for the UofA Wildcats and the Los Angeles Dodgers.


Regina Najera, MD

Dr. Najera specializes in comprehensive ophthalmology, premium cataract surgery, glaucoma and laser vision correction. She is Board Certified by the American Board of Ophthalmology and is a member of the American Academy of Ophthalmology.  Dr. Najera received her undergraduate degree from Columbia University, a master’s degree in education from Harvard University and her medical degree from the University of Wisconsin – Madison in 2001.  She also received her MBA from the Eller College of Management in Tucson in 2015.

After college, Dr. Najera began her career in the financial sector and then decided to pursue a career in medicine.  She completed her ophthalmology residency at the Eye Institute of the Medical College of Wisconsin in 2006.  Dr. Najera speaks Spanish and enjoys learning new languages, book and debate clubs, running and traveling with her husband and three children.  She has served on the Board of the Tucson Hispanic Chamber of Commerce and chaired their Health Committee. Dr. Najera is committed to helping patients improve their health through education and she is also active in helping patients gain better access to care by addressing disparities within the larger health care system.


Jamie Kuhn, OD, FAAO, FSLS

Originally from Northern California, Dr. Kuhn received her Bachelor of Science degree in Neurobiology, Physiology, and Behavior from the University of California at Davis. She graduated cum laude from the Southern California College of Optometry with an interest in Contact Lenses and Corneal Disease and then completed a residency in Cornea and Contact Lenses at the Northeastern State University Oklahoma College of Optometry.

Dr. Kuhn is a fellow of the American Academy of Optometry, a fellow of the Scleral Lens Education Society, and a committee member for the Arizona Optometric Association. She consults with industry partners to educate professionals and students both locally and nationwide. She is also rigorously involved with the state association to educate the public and legislative leaders on the ability of optometrists to address the visual and ocular health needs of the population. Dr. Kuhn provides full-scope optometric care with an emphasis on specialty contact lenses and fitting prosthetic eyes. She has recently moved to Sahuarita with her husband and three children. In her free time, she enjoys mountain biking, hiking, and baking.