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. 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.
Our doctors will 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:
Katie Rippley, OD, Diplomat ABO; President & CEO EyeCare of Denton
Specializing in Family Optometry with primary interest in eye and vision problems of all ages. Specialty interest includes contact lenses, keratoconus, corneal disease, glaucoma, diabetic eye disease and macular degeneration.
Dr. Rippley's professional career has spanned more than 30 years. She joined Cornea Associates of Texas in 1986 upon graduation from the University of Houston College of Optometry. She founded EyeCare of Denton in 1988 where she currently practices. Dr. Rippley is Board Certified by the American Board of Optometry and is an Optometric Glaucoma specialist. Dr. Rippley is a long standing member of the American Optometric Association, the Texas Optometric Association, and the North East Texas Optometric Society and is an alumni of Chi Omega.
Dr. Rippley is married to fellow optometrist, Dr. Kim Castleberry. They have 4 adult children and 5 grand kids. Family time in California, sailing, beach going, working out, cooking, shopping, bicycling, reading and dining are favorite past times. You can even spot Dr. Rippley on the back of her husband's motorcycle cruising down Pacific Coast Highway from time to time!
Dr. Kim Nguyen is a licensed therapeutic optometrist and optometric glaucoma specialist. Dr. Nguyen earned her Doctorate in Optometry from the University of Houston College of Optometry where she graduated Cum Laude. Prior to this, she graduated from the University of Waterloo and received a Bachelor of Science in Biomedical Science, with minors in both Psychology and Biology. Dr. Nguyen has been caring for her patients here at Eye Care of Denton since graduating in 2013.
Dr. Nguyen completed her clinical externships at the Eye Center of Texas and Berkeley Eye Center in Houston, Texas. She provided primary care and treatment of ocular diseases including dry eye, glaucoma, and macular degeneration. In addition, she received training in pre and post-operative care for cataract and LASIK patients. Here at Eye Care of Denton, Dr. Nguyen performs routine exams, specialty contact lens evaluations, post-operative care and provides treatment of ocular pathologies.
Dr. Nguyen was born and raised in Toronto, Canada. Her husband is also an optometrist, and they have a young son together. In her spare time she enjoys baking, gardening, traveling, and spending time with family and friends. Dr. Nguyen is a longstanding active member of the Texas Optometric Association as well as the American Optometric Association.
Dr. Jacquelyn Sugianto is a licensed therapeutic optometrist and certified glaucoma specialist who provides a variety of vision services including comprehensive eye exams, fitting contact lenses, and diagnosing and managing ocular pathology. She grew up in Katy, Texas where she graduated as valedictorian of her high school. She earned a Bachelor of Science in Biology with high honors from the University of Texas at Austin and received her Doctorate of Optometry from the University of Houston. After graduating summa cum laude in 2013, she has very much enjoyed serving as an optometrist in DFW.
While at the College of Optometry Dr. Sugianto earned clinical honors, held a leadership role in the Beta Sigma Kappa Optometric honor society, and was awarded membership to the Gold Key International Honor Society which is considered the highest honor for leadership a student of optometry can achieve. She participated in a clinical internship at Bridge Builders Eye Clinic which provided care for indigent populations. She is a long-standing member of the Texas Optometric Association as well as the American Optometric Association.
In her leisure time, Dr. Sugianto enjoys reading and spending time with her family and friends. Her husband is also an optometrist, and they have a young son together, whom they adore. She loves musicals along with singing and playing violin in her church choir.
Dr. Tuquynh (Kristy) Duong is a compassionate and dedicated licensed therapeutic optometrist and optometric glaucoma specialist. She performs comprehensive eye exams with an interest in primary care, ocular disease management and specialty contact lenses. Dr. Duong graduated with a Bachelor of Science in Microbiology from Louisiana State University in 2020. She earned her Doctor of Optometry from Pennsylvania College of Optometry in 2024, graduating with Magna Cum Laude honors and distinction for clinical excellence in neuro-ophthalmic diseases.
While completing her externships, she has gained extensive clinical experience in diagnosing and managing various eye conditions, including glaucoma, diabetic retinopathy, age-related macular degeneration and preoperative and postoperative care.
During her optometric training, Dr. Duong developed a keen interest in contact lenses. She completed an advanced contact lens studies course where she received specialized training in fitting various types of contact lenses, including soft, rigid gas permeable, and specialty lenses for conditions such as keratoconus and astigmatism. In addition to her academic endeavors, she also held membership in service organizations such as Lions Club. She was also a member of Beta Sigma Kappa Optometric Honor Society and Gold Key International Honor Society. She is
currently a member of Texas Optometric Association and American Optometric Association.
Outside of the workplace, Dr. Duong enjoys fitness, traveling, and spending time with her family and friends. She is excited to embark on her career as an optometrist and looks forward to making a positive impact on the lives of her patients.
