Our Doctors

Meet Our Doctors

Optometrists in Greeley, CO

Our doctor-owners have been living in and providing general eye care to the residents of Northern Colorado since 1996. We are proud to have served patients of all ages. Our motivation for starting our group office was the desire to manage and enhance every aspect of our patient care model without outside influence. Our office has experienced significant growth every year and always accepts new patients. We try to make sure same day appointments are usually available for urgencies.

What is an Optometrist?


Doctors of Optometry (Optometrists or O.D.’s) are the doctorate level, state licensed, primary health care professionals for the eyes and visual system. They examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. In addition they prescribe eyeglasses, contact lenses, topical and oral medications, low vision rehabilitation, and vision therapy. A prescription for eyewear is a very common patient need. This critically important component of clear vision in our office, is measured and prescribed directly by our doctors. Your precious visual clarity means we never utilize technicians to provide this critical part of most eye/vision evaluations.

In addition, our optometrists perform other procedures, such as removing metal foreign bodies from the anesthetized eye. When appropriate, optometrists counsel their patients regarding surgical and non-surgical options that meet their visual needs related to their occupations, avocations and lifestyle.

Our Optometrists


Mildred Lopez Dinnebeck, BS, OD

Dr. Mildred Dinnebeck, formerly and still known by her patients as Dr. Mildred Lopez, is a comprehensive optometrist who has been providing eye and vision care in Greeley since 1996. She is licensed by the Colorado State Board of Optometry, as well as the Texas State Board of Optometry (inactive).

A native of the United States Commonwealth Island of Puerto Rico, she is completely fluent in English as well as Spanish, and is happy to perform your eye examination in either language. Although both Dr. Dinnebecks’ are qualified and enjoy seeing kids, Dr. Lopez has a special interest in pediatric eyecare.

Dr. Lopez, as her patients know her, earned her Bachelor of Science degree from the University of Houston. She then earned her Doctor of Optometry degree from the University of Houston College of Optometry (UHCO). At UHCO, she especially enjoyed helping challenging pediatric patients in the Pediatric Specialty clinics.

Dr. Lopez Dinnebeck’s qualifications were enhanced by external rotations in San Antonio, Texas. A patriotic American, at Randolph Air Force Base, she enthusiastically provided primary vision care (link to services page) to military families. Subsequently at the prominent Cataract and LASER Eye Institute of San Antonio, she was involved in pre/post refractive surgical care, care of the diabetic patient, as well as management of the patient with glaucoma.

Dr. Lopez holds the highest level of optometry license available to Colorado optometrists and enjoys helping patients of all ages achieve their best eye vision and health. Dr. Lopez was listed in the Who’s Who of American Professionals.

She enjoys time with Dr. James and their children (now young adults), cooking, sewing-fabrics, DVD movies, Puerto Rico current events, and any trip to a sandy beach.

James Dinnebeck, BS, OD

James Dinnebeck is a comprehensive optometrist with a special interest in maximizing a patient’s appearance in eyewear, multifocal contact lenses, macula degeneration, cataract, and ocular nutrition. He is licensed by the Colorado State Board of Optometry, and by the Texas State Board of Optometry(inactive).

A northern Colorado native and optometry patient, Dr. Dinnebeck earned his Bachelor of Science degree from Colorado State University, graduating as a member of his major’s scholastic honor society. After a successful postgraduate period in industrial construction engineering, employed on the largest engineering-design project in the world, he returned to university studies and completed his Doctorate in Optometry, at the University of Houston. His qualifications were enhanced by a double eye externship at the Eye Institute of San Antonio, which is a leading south Texas referral center for eye diseases, refractive surgery, and education.

After graduation, Dr. Dinnebeck practiced optometry in San Antonio for two years before returning to his native northern Colorado. During this time he was involved in the care of a large number of patients with diabetes. He is happy to report that in 2016, he sees much less severe diabetic retinopathy (the serious diabetic eye health disease) than in the early 1990’s. Management of the diabetic patient is improving!

Dr. Dinnebeck holds the highest level of optometry license available to Colorado optometrists, and enjoys helping patients of all ages achieve their best eye vision, health, and wellness. He participates in children’s community support as a member of Greeley’s Kiwanis of the Rockies.

He enjoys time with Dr. Mildred and their children (now young adults), tuning high performance engines and American race cars, training in Japanese martial arts, building electric guitars and music recording, and reading.

Dedicated to Patient Care & Quality Optometry Services

Our doctors welcome patients of all ages with a variety of eye problems including refractive errors, eyeglasses and contact lens prescriptions, ocular diagnosis and management of cataract, diabetes, dry eye, infections, inflammatory conditions of the eyes, and trauma. We are proud to offer the latest in optometric techniques. Both of our optometrists have traveled out of the mainland USA to attend international continuing education training. In 2016, they were the only colorado optometrists attending a national continuing education conference in San Antonio, Texas.


For more information about our practice, or to schedule an appointment, please contact Apex Vision & Wellness at 970-330-7200 today. We look forward to hearing from you!

970-330-7200