- We strive to provide complete care for our patients. Learn more about all the services we provide.
Meet the Doctors
Our team of qualified doctors at Lone Star Vision is dedicated to helping their patients keep their eyes healthy and their vision as accurate as possible. Each doctor takes great pride in getting to know their patients and educating them on how to care for their eyes.
Todd Brantley, O.D.
Dr. Todd Brantley grew up in Ft. Worth, Texas and lives in Celina with his wife, Wendy, and their daughter, Makenna. He received his Bachelors of Science degree and Doctorate of Optometry from the University of Houston, graduating Magna Cum Laude in 1999. Dr. Brantley is a Diplomate of the American Board of Optometry and dedicated to expanding his knowledge and expertise though ongoing continuing education and training. He is passionate about helping people and recognized for the exceptional care he provides his patients.
As a contact lens specialist, Dr. Brantley utilizes the latest lens designs to help patients reach their highest level of success and freedom from glasses. He is among the first optometrists to fit the Paragon CRT contact lenses, a non-surgical alternative to vision correction. Dr. Brantley is a certified Optometric Glaucoma Specialist and manages various eye disorders such as dry eye syndrome, macular degeneration, diabetic-related eye conditions, and allergic conjunctivitis.
Serving the communities in which he lives and practices remains a priority to Dr. Brantley. He is a proud supporter of Optometry Giving Sight program and helped start the Grace Bridge Eye Clinic in Celina, which provides free exams to those in need of glasses. Dr. Brantley is an active member of Vision Source, Texas Optometric Association, American Optometric Association, Northeast Texas Optometric Society, Celina Chamber of Commerce, and Lifeway Church.
Dr. Brantley is an avid sports fan and kid-at-heart! In his spare time, you'll find him playing, watching, or coaching sports. He excelled in sports and was a two-time All Conference pitcher at Howard Payne University.
Olivia Carleo, O.D.
Dr. Olivia Carleo, a therapeutic optometrist and optometric glaucoma specialist, grew up in the Dallas area, where she attended The Hockaday School. She received her Bachelor of Arts in Biology at Austin College and pursued her doctorate of optometry degree at the University of Houston College of Optometry.
Dr. Carleo was one of a limited number of students to receive a Clinical Letter of Excellence recognizing her success in Family Practice. Her work on Stargardt's Disease was published in Institute for Optometric Practice. During her externships, Dr. Carleo was highly trained incontact lens fitting, pre- and post-operativeLASIK management and ocular diseases such as glaucoma, diabetic retinopathy and age-related macular degeneration. Dr. Carleo also has a special interest in dry eye and ocular allergy management. She is a member of theAmerican Optometric Association, Texas Optometric Association, Dallas County Optometric Society and the Beta Sigma Kappa Optometric Honor Society.
Dr. Carleo enjoys playing the piano, dancing, traveling and foreign cuisine. She is conversant in French, Italian and Spanish. Dr. Carleo looks forward to seeing you at your next appointment at Lone Star Vision!
Brad Hanstad, O.D.
Dr. Brad Hanstad, O.D. is a therapuetic optometrist, who grew up in North Dakota and relocated to Frisco in 2012, after practicing primary care optometry for 15 years. Experienced in managing many conditions of the eye, including: dry eye syndrome, allergic conjunctivitis, diabetic eye disease, macular degeneration, and other retinal disorders, he has also co-managed LASIK and cataract surgeries. He has special interest in Contact Lenses and Sports Vision.
Dr. Hanstad received his Bachelor of Science degree in Biology at Dickinson State University, and earned a Doctorate of Optometry degree from Southern California College of Optometry, where he was named the Valedictorian of his class. He is a member of the American Optometric Association, Texas Optometric Association, and Beta Sigma Kappa Optometric Honor Society.
Dr. Hanstad enjoys spending time with his wife Robbyn and their five children. He played both golf and baseball in college and was a two-time all-conference short-stop, and named an Academic All-American his senior season. He and his family have made numerous mission trips to an orphanage in Brazil, providing eyecare to children in need. Dr. Hanstad is a welcome addition to our Lone Star Vision staff!
Paola Diaz, O.D.
Dr. Paola Diaz is a native Texan, born and raised in Houston, and eventually moving to Austin during her high school years. In Austin, she graduated from Westwood High School and she then attended The University of Texas at Austin where she received her Bachelor of Arts in Biology. Following her undergraduate degree, Dr. Diaz received her Optometry training from The University of Houston College of Optometry, completing the program with Magna Cum Laude distinction. Upon receiving her Doctorate in Optometry, she was selected among a competitive pool of applicants to participate in a one-year post-graduate residency program at Cedar Springs Eye Clinic (formerly known as BridgeBuilders) in Dallas where she had the opportunity to specialize in her passion, ocular disease.
Dr. Diaz, a therapeutic optometrist and glaucoma specialist, has extensive experience and training in ocular pathology where she has diagnosed, treated, and managed various stages of ocular diseases such as glaucoma, diabetic retinopathy, keratoconus, amblyopia, and age-related macular degeneration. She is also experienced in the treatment of dry eye, pre- and post- operative cataract management, and complex contact lens fittings for medical needs. Her work and experience has led to publishing and presenting cases to both the Texas Optometric Association and the American Academy of Optometry.
Dr. Diaz is an active member in the American Optometric Association, Texas Optometric Association, TOA New Grad Taskforce, Dallas County Optometric Society, and Beta Sigma Kappa International Optometric Honor Society. She is fluent in Spanish, and outside of clinic, Dr. Diaz enjoys running, kick boxing, being outdoors, and spending time with her family. Dr. Diaz strives to provide superior eye care and looks forward to being your eye care provider.
Benjamin Lundeen O.D.
Dr. Benjamin Lundeen is a therapeutic optometrist. Although he was born in Oklahoma, he moved to Houston during high-school and has considered himself a Texan ever since. Dr. Lundeen graduated from Texas A&M University with a Bachelor’s of Science in Biology. He continued his education at Northeastern State University Oklahoma College of Optometry, graduating with his Doctorate of Optometry in 2012 with Summa Cum Laude honors. Dr. Lundeen completed an externship focusing on ocular disease, including management of dry eye, ocular allergies, keratoconus, glaucoma, macular degeneration and diabetic retinopathy. He is also highly skilled in fitting contact lenses and is passionate about optimizing each patient’s visual correction to fit their lifestyle.
For the past three years Dr. Lundeen has served as a Captain in the United States Air Force, stationed as an active duty optometrist at Lackland Air Force Base in San Antonio, TX. He considers it a privilege to have had the opportunity to take care of the many demanding visual needs of active duty service members, veterans, and their families. He plans to continue his service as a member of the Texas Air National Guard.
Over the last four years Dr. Lundeen has been actively involved in serving medical missions. He has participated and led mission trips to Honduras and Belize, providing eye care to over 4,000 underserved patients. His unit recently supported trips to El Salvador and the Dominican Republic, where over 5,000 patients received health and eye care.
Dr. Lundeen enjoys spending time with his wife Anna, and daughter, Sada. They are also expecting a baby boy in August. In his spare time he enjoys music, being outdoors, playing golf, and watching and/or playing sports. He is committed to your long-term ocular health needs and is excited to have you as a patient!