Find a Specialist

Dr. Natalia Morales is an ophthalmology fellow dedicated to making each patient feel comfortable and empowered during their visit. Her passion for patient care began in a medical magnet high school, where she saw the impact of meaningful doctor-patient connections, inspiring her mission to provide excellent, compassionate care with a focus on trust and clear communication. She earned her undergraduate degree at Yale University and her medical degree at Vanderbilt School of Medicine. Dr. Morales completed her ophthalmology residency at Barnes-Jewish Hospital/Washington University, where she received the Drs. James and Linda Duan-Song Award for Clinical/Surgical Excellence, reflecting her dedication to patient care. At Vance Thompson Vision in Sioux Falls, SD, Dr. Morales actively participates in clinical research trials to bring the latest advancements to her practice. She is committed to evidence-based care, ensuring patients understand their conditions and treatment options with thoughtful guidance.

Dr. Elizabeth Chiang is an oculoplastic and reconstructive surgeon who focuses on eyelid and periocular procedures that restore function and enhance appearance. She performs upper and lower blepharoplasty, ptosis repair for droopy eyelids, brow lift procedures, and correction of eyelid malposition such as entropion and ectropion. Her practice also includes eyelid lesion removal, complex reconstruction after Mohs surgery or injury, tear duct procedures, and office-based treatments like Botox and filler injections. Dr. Chiang earned her undergraduate degree from the California Institute of Technology and completed MD/PhD training in neuroscience through the Medical Scientist Training Program at Case Western Reserve University. She completed ophthalmology residency at Northwestern University and a two-year oculoplastic and reconstructive surgery fellowship at the Medical College of Wisconsin. She brings a careful, detail-oriented approach designed to help patients feel comfortable and confident in their care.

Dr. Elizabeth A. Atchison is a fellowship-trained vitreoretinal surgeon who cares for adults with a wide range of retinal and vitreous disorders. Patients appreciate her clear explanations, steady surgical skill, and the continuity of care that retina practice provides—from urgent evaluations through long-term follow-up. Raised in Sioux Falls, she is grateful to serve the community she calls home and sees patients in both the Sioux Falls and Yankton offices. Dr. Atchison completed medical school at Northwestern University Feinberg School of Medicine, ophthalmology residency at the Mayo Clinic, and a vitreoretinal surgery fellowship with Illinois Retina Associates and Rush University. She partners closely with referring optometrists and ophthalmologists to provide timely diagnosis, advanced treatment, and compassionate guidance tailored to each person’s needs. Whether managing diabetic retinopathy, treating retinal tears and detachments, or monitoring age-related macular degeneration, her goal is to protect vision with evidence-based care and thoughtful communication.

Dr. Daniel Terveen is a fellowship-trained ophthalmologist who specializes in refractive cataract surgery, advanced corneal disease treatment, glaucoma care, and laser vision correction. Patients value his blend of surgical precision and down-to-earth explanations that make complex choices feel clear and manageable. During residency at the University of Iowa, Dr. Terveen earned top resident and research awards and helped launch quality-improvement initiatives that streamlined cataract care for veterans. He continues that spirit of innovation at Vance Thompson Vision, where he serves as a principal investigator in FDA-monitored clinical trials and has published and presented on topics including complicated cataract surgery, corneal transplantation, and clinic efficiency. In each visit, he focuses on personal goals—whether sharper vision for work, sports, or daily life—and designs a tailored plan using modern techniques and technologies. Outside the operating room, he enjoys time with family, cooking, reading, and staying active.

Dr. Yujia Zhou is a fellowship-trained ophthalmologist who provides medical and surgical care for glaucoma alongside comprehensive eye care. Her clinical practice includes minimally invasive glaucoma surgery, laser procedures, drainage devices, filtration surgery, and cataract surgery, with an emphasis on tailoring treatment plans to each patient’s goals and lifestyle. She welcomes patients for routine and problem-focused visits and communicates clearly about options so patients can take an active role in decision-making. Dr. Zhou completed a glaucoma fellowship at Bascom Palmer Eye Institute in Palm Beach Gardens, ophthalmology residency at the University of Minnesota, and medical school at Chicago Medical School at Rosalind Franklin University. She is board-certified by the American Board of Ophthalmology and speaks English and Mandarin. Her background includes professional society involvement and recognition during training, and she is committed to compassionate, respectful care for every patient she serves.

Dr. Jed Assam is a board-certified ophthalmologist and fellowship-trained retina specialist dedicated to diagnosing and treating complex retinal disease. A Sioux Falls native, he is proud to care for patients in the community that inspired his path in medicine, combining advanced surgical skills with a calm, personable approach to every visit. His expertise spans medical and surgical retina, including the use of intravitreal injections, retinal laser procedures, and minimally invasive techniques tailored to each patient’s needs. Dr. Assam completed ophthalmology residency training at the University of Texas Medical Branch, where he served as chief resident, followed by a two-year vitreoretinal surgery fellowship at the University of Texas Health Science Center in San Antonio. He earned his MD from the USD Sanford School of Medicine and a master’s degree in Human Clinical Anatomy from Creighton University, building a strong foundation for precise, anatomy-guided care. He has participated in research at the intersection of vision science and flight safety and enjoys teaching medical trainees. Outside of clinic, he spends time outdoors hunting and fishing, and he loves cooking for friends and family.

Cory Bergman, MD, is a comprehensive ophthalmologist specializing in cataract surgery and anterior segment care. He tailors treatment plans to each patient’s goals and lifestyle, offering a full range of modern lens options and technologies to help reduce dependence on glasses after surgery. Dr. Bergman sees patients in Rapid City and also provides cataract care in regional satellite locations, making specialty services more convenient for people across the Black Hills and beyond. He attended medical school at the University of Colorado and completed his ophthalmology residency at Loma Linda. Before moving to South Dakota, he practiced in the Pacific Northwest. Patients often describe his approach as clear, calm, and collaborative—he takes time to explain findings, review lens choices, and set expectations so there are no surprises on surgery day. Outside the clinic and OR, he enjoys exploring the Black Hills with his wife and four boys. If you’re considering cataract surgery, Dr. Bergman will meet you where you are and guide you to a plan that fits your vision needs.

Dr. Brent Kramer is a board-certified ophthalmologist who specializes in advanced surgical procedures for cataract, LASIK, cornea, and glaucoma. His approach to patient care is deeply personal, as he strives to know each patient by name, understand their story, and address their specific needs. This commitment ensures that treatments are tailored to individual lifestyles and goals. Having completed his fellowship at the renowned Duke University Eye Center, Dr. Kramer brings a high standard of expertise and innovation to his practice. He serves patients in Sioux Falls, South Dakota, and Alexandria, Minnesota, providing accessible, top-tier eye care in both communities. Beyond the operating room, Dr. Kramer is actively engaged in advancing the field through clinical research. He has published several articles and book chapters focused on astigmatism and lens implants, and he frequently presents at national conferences. His dedication to excellence extends to his professional affiliations, including membership in the American Academy of Ophthalmology and the American Society of Cataract and Refractive Surgeons.

Dr. Andrea Bordewyk is an ophthalmologist and corneal specialist who focuses on cataract and refractive surgery. She provides expert comprehensive surgical care for conditions affecting the cornea, cataracts, and refractive errors, helping patients achieve better vision. She completed her medical education at the University of South Dakota Sanford School of Medicine, where she graduated summa cum laude with a Doctor of Medicine. Her academic journey began with a Bachelor of Science in Biology and a minor in Psychology from the University of South Dakota, also completed summa cum laude. Her dedication to academic and clinical excellence is reflected in honors such as the Gayle Rutherford Research Award and the Dr. Joseph Sassani Pathology Award. In addition to her corneal specialization, Dr. Bordewyk is a trained and experienced LASIK surgeon, offering advanced laser vision correction procedures. She is currently accepting new patients and looks forward to serving the tri-state community with high-quality eye care services.

Dr. Hadly “Carson” Eisenbeisz is a comprehensive ophthalmologist dedicated to helping patients protect and improve their vision. Raised in Pierre, South Dakota, he discovered early how life-changing clear sight can be and brings that sense of purpose to every visit. He provides routine and surgical care for adults and families across the Black Hills, offering thorough exams, straightforward explanations, and personalized treatment plans so patients feel informed and comfortable at each step. Dr. Eisenbeisz earned his undergraduate degree from South Dakota State University and his medical degree from the University of South Dakota Sanford School of Medicine. He completed an ophthalmology residency at the University of Missouri–Kansas City following a preliminary year in internal medicine. He has participated in outreach work in Ghana and Northern India and enjoys an active life with his family. Dr. Eisenbeisz is honored to serve the region and welcomes patients seeking preventive care, second opinions, or surgical solutions to restore clear, confident vision.

Dr. Tanner Ferguson is a board-certified, fellowship-trained ophthalmologist with Vance Thompson Vision. He cares for patients in Sioux Falls, SD, and South Sioux City, NE, with a special interest in refractive cataract surgery and laser vision correction. Dr. Ferguson believes the best outcomes start with listening—understanding your visual history, daily tasks, and goals—and tailoring a plan that fits your life. He completed medical school at the University of South Dakota, ophthalmology residency at the Cleveland Clinic Cole Eye Institute, and advanced fellowship training at Vance Thompson Vision. Early research mentorship with Dr. Vance Thompson and Dr. John Berdahl sparked a lasting commitment to patient-focused, evidence-based care, and he remains active in clinical research to advance options for cataract and corneal treatment. Whether you are exploring LASIK or considering lens surgery, Dr. Ferguson explains each step clearly and partners with you from consultation through recovery so you feel confident and comfortable throughout your care.

Dr. Rocío Díaz is a board-certified ophthalmologist who practices medical and surgical retina care, including vitreoretinal surgery. She evaluates and treats retinal diseases that can affect central vision, peripheral vision, and visual clarity, and she works with patients to protect vision over time. Dr. Díaz completed a fellowship in medical and surgical retina at the Truhlsen Eye Institute at the University of Nebraska Medical Center and completed ophthalmology residency training at the Hamilton Eye Institute at the University of Tennessee Health Science Center at Memphis. She earned her medical degree from the University of Panama School of Medicine. Fluent in English and Spanish, she emphasizes compassionate, effective care and partners with patients and families on a plan that fits their needs.

Dr. Andrew Ollerton is a board-certified ophthalmologist who specializes in cornea care and ophthalmic surgery. He provides surgical services including cataract surgery, corneal transplants such as DMEK, and laser corrective procedures like LASIK and PRK. Dr. Ollerton treats conditions such as cataracts, corneal infections and dystrophies, dry eye, keratoconus, and refractive errors. He is committed to treating patients like family members, helping each patient understand their eye health options to make informed decisions, and ensuring they receive the treatment they need. Fluent in English, Spanish, and Russian, Dr. Ollerton can communicate effectively with a diverse range of patients. With advanced fellowship training in Cornea and Refractive Surgery from Oregon Health and Science University, Dr. Ollerton brings expertise to his practice. He has received a patient rating of 4.7 out of 5 from 247 ratings, reflecting his dedication to quality care.