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Optometrist in Round Rock, TX 78681

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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. Aspire Vision Care’s 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.

The optometrists at our Round Rock, TX eye clinic 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:


Nancy Guenthner, OD, FCOVD

Developmental Optometrist

Dr. Nancy Guenthner (pronounced “Get-ner”) is the Developmental Optometrist at Aspire Vision Care. She received her Bachelor of Science degree with High Honors from the University of Texas at Austin. Dr. Nancy went on to attend the University of Houston College of Optometry where she graduated Summa Cum Laude with her Doctor of Optometry degree. She is Board Certified in Vision Development and Vision Therapy and has over 200 hours of continuing education in this field.

Dr. Nancy and her husband, Chris, founded Aspire Vision Care in 2010. Dr. Nancy has a passion for helping children and adults that have vision problems that affect their ability to read and learn. She has been involved in this area of optometry for over 15 years and after seeing the children’s lives changed through Vision Therapy, she knew this was what she was meant to do in life!

Dr. Nancy is very involved in her profession and the community. She is a member of the Central Texas Optometric Society, College of Optometrists in Vision Development, and Optometric Extension Program Foundation. She is also actively involved in the Rotary Club of Round Rock and is a 2015 graduate of Leadership Round Rock. Dr. Nancy and Chris live in Round Rock with their son, Nicholas, and two daughters, Grace and Emily.


Carissa Lumby, OD


Dr. Carissa Lumby is a licensed Therapeutic Optometrist and is a certified Optometric Glaucoma Specialist. She received her Bachelor of Science in Biology from the University of Texas at Austin. Dr. Lumby graduated Summa Cum Laude from the University of Houston College of Optometry (UHCO). She is a member of the American Optometric Association, Texas Optometric Association, Central Texas Optometric Association, and Beta Sigma Kappa Optometric Honor Society.

Dr. Lumby enjoys working with patients of all ages. She was awarded a Contact Lens Clinical Excellence Award by UHCO and fits various contact lenses including soft, toric, multifocal, gas permeable, hybrid, and scleral lenses. She manages ocular conditions such as ocular allergies, macular degeneration, glaucoma, and diabetic retinopathy. She has a special interest in the treatment of dry eye syndrome, which she has published research on. She spent one of her clinical rotations co-managing refractive surgery (such as LASIK) and cataract surgery.

In her free time Dr. Lumby likes playing tennis, cooking, reading, and crafting and DIY projects. She also enjoys spending time with her husband and their two cats, Merry and Pippin. She looks forward to taking care of you and your family at your next appointment!