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Meet The Optometrists

Mark D. Henry, O.D.

Dr. Mark D. Henry, O.D.

Owner and CEO of Primary Vision Care

Dr. Mark Henry received his Doctor of Optometry Degree from the Illinois College of Optometry in 1993 and has been practicing for over 25 years. In addition, Dr. Henry received his Bachelor of Arts degree in English from Kenyon College and has attended Ohio State University for Post-Graduate continuing education.

Dr. Henry has served as a member of the Ohio Optometric Association, the American Academy of Optometry and the American Optometric Association. His awards include membership in the Gold Key Optometric Honor Society, former Leadership and Service scholar and Illinois Alumnus of the Year.

Dr. Henry owns and operates Primary Vision Care offices in Newark, Lancaster, Mount Vernon, Wilmington and Waynesville, Ohio while residing in the area with his wife and four children.

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Courtney Hammond, O.D.

Dr. Courtney Diaz (Hammond), O.D.

Medical Director of PVC

Dr. Courtney Hammond Diaz is the primary optometrist in our Newark location and practices family optometry with a special interest in pediatrics and specialty contact lenses. Primary Vision Care is also pleased to have Dr. Hammond Diaz serve as the acting Medical Director of the practice and is charged with creating, directing and maintaining the standard of patient care that is delivered by all optometrists in each of our locations.

Dr. Hammond Diaz was born and raised in Newark, Ohio and joined our practice initially during her high school years as a technician and front desk assistant. She attended Licking Valley High School where she ultimately graduated with honors as the salutatorian of her class. She then went on to Miami University (OH) where she graduated with a Bachelor of Arts degree in zoology and was actively involved in various organizations and extracurricular activities including research in visual psychophysics. Dr. Hammond Diaz earned her Doctorate of Optometry degree as a cum laude graduate of the University of the Incarnate Word Rosenberg School of Optometry in San Antonio, Texas. During her time there, Courtney was the recipient of several awards recognizing her academic and clinical excellence and was invited into the Gold Key International Optometric Honor Society and the Beta Sigma Kappa International Optometric Honor Society. She also served as student body president, lead teaching assistant of clinical skills to her fellow colleagues and received the university leadership award for her class.

Dr. Hammond Diaz completed externships in several different modes of practice throughout her education. She studied at the Southern Eye Institute in Memphis, Tennessee where she gained a strong understanding of ocular disease and treatment. While there, she participated in tertiary eye care including comprehensive eye examinations, glaucoma, retinal, cataract and LASIK evaluations, and helped manage pre- and post-operative visits. Dr. Hammond Diaz also completed externships at the UIW Eye Institute, the San Antonio Lighthouse for the Blind, and the Fayetteville VA Hospital in North Carolina where she gained valuable experience in the diagnosis of eye disease as it pertains to overall systemic health. Following graduation, Dr. Hammond Diaz returned to join our private practice and has participated in patient care in our Newark, Lancaster and Mt. Vernon locations.

Dr. Hammond Diaz now resides in Blacklick with her husband, daughter and their puppy. When she is not in clinic, she prefers to spend quality time with her extended family and friends and she also enjoys traveling, volunteering within the community and attending concerts and sporting events (especially anything in Cleveland).

Dr. Haack

Dr. Lauren Haack


Dr. Lauren Haack is the primary optometrist in our Wilmington and Waynesville locations and practices family optometry with an emphasis on ocular disease and contact lenses.

Dr. Haack was born and raised in mid-Michigan. She attended Central Michigan University for her undergraduate studies majoring in biology and minoring in chemistry. She graduated with a Bachelor’s of Science and then went on to attend Michigan College of Optometry at Ferris State University. She graduated with high distinction in 2013.

During her education, Dr. Haack also completed a variety of externship programs including ocular disease training at the Aleda E. Lutz VA hospital, Michigan State University Neuro-Ophthalmology clinic, Rosenbaum Eye and Laser Center, and Duane L. Waters Hospital. She also had the opportunity to further her knowledge of contact lenses and family eye care at Holt Eye Care.

Dr. Haack has been practicing in the Bellbrook area since 2013 before joining our team in 2022 and transitioning to private practice eyecare. Dr. Haack resides with her husband, three kids, and dog in the Beavercreek area. In her spare time, she enjoys camping and spending time with her family.

Dr. Haack

Dr. Erica Treiber


​​​​​​​Dr. Erica Treiber received her Doctor of Optometry Degree from The Ohio State University College of Optometry where she was a member of the Ohio Optometric Association and the American Optometric Association. Dr. Treiber was awarded with the Excellence in Primary Care Award during her last year of optometry school at Ohio State. She has strong interests in family vision care, contact lenses and ocular diseases including glaucoma and diabetes. Dr. Treiber is our primary doctor in our Lancaster location and is happily welcoming both new and established patients to the practice.

While at Ohio State, Dr. Treiber completed externships in Upper Arlington, Toledo and Columbus, Ohio. Her training in Upper Arlington included primary vision care and specialty contact lenses. Dr. Treiber also completed an externship at the Toledo Veteran Affairs where she managed various ocular diseases among our veterans. She also has experience in pediatrics, binocular vision disorders and low vision.

Dr. Treiber is originally from Unionville, Michigan where she grew up on a farm raising organic crops and various farm animals. After graduating as salutatorian of her high school class, she went on to attend The University of Tennessee, Knoxville where she was a member and team captain of the women’s volleyball team.

Dr. Treiber has a strong passion towards community and educating her patient’s on the importance of their health. In her free time, she likes to watch sporting events, play with her dog and spend time with friends and family.

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