Our Doctors

Dr. Lindsay Greiten grew up in Germantown, Wisconsin. She attended the University of Wisconsin – La Crosse where she double majored, earning a Bachelor of Science degree in Biochemistry and Biology with a Biomedical concentration. Upon graduation, Dr. Greiten spent time working as an optical lab manager, optician, and optical retail sales manager to gain a better understanding of the multifaceted optical industry. She then completed her Doctorate of Optometry degree at the University of Missouri – St. Louis College of Optometry where she graduated on the Dean’s List. Here she was a leader in several organizations including Volunteer Optometric Society for Humanity, Beta Sigma Kappa, and served as a Student Ambassador. While in school, she had the opportunity to volunteer on a medical mission trip to Honduras to provide eye care and eye wear to those in need. Throughout her academic career, she has had extensive training from some of the pioneers in her field and has gained expertise in all aspects of primary care optometry including pediatrics, low vision, and surgical co-management. During her four years of optometry school she worked at a progressive optometry practice which allowed her to sharpen her clinical skills. Her professional interests include contact lenses and ocular disease. Dr. Greiten is a member of the American Optometric Association, the Arizona Optometric Association, and the Southern Arizona Optometric Society. Dr. Greiten prides herself on ensuring patient satisfaction with a friendly atmosphere, and strives to leave patients feeling well taken care of with a better understanding of their ocular health. In her free time, Dr. Greiten enjoys traveling, outdoor activities, sand volleyball, and spending time with her husband, Jacob and two young puppies.

Dr. Sean Gretz is a native of Scranton, Pennsylvania. He earned his bachelor's degree in cellular neuroscience from St. Lawrence University in New York. He then completed his professional training at the Pennsylvania College of Optometry at Salus University, where he graduated in 2018 with clinical honors. Following graduation, Dr. Gretz completed a residency program in primary care and ocular disease at The Eye Institute in Philadelphia, PA. Dr. Gretz provides comprehensive, primary eye care with a focus on ocular disease and emergency medicine. He is currently a member of the Maryland Optometric Association and the American Optometric Association. In 2022, Dr. Gretz achieved Diplomate certification from the American Board of Optometry. In his spare time, Dr. Gretz enjoys cooking and watching movies. He has recently relocated to Maryland with his family.

Dr. Natasha Griffis earned a Bachelor of Science degree in Biology, first class standings, in Ontario, Canada. She obtained her Doctor of Optometry degree in 2011 from The New England College of Optometry in Boston, MA. Currently, she holds licenses to practice optometry in New York State and Ontario, Canada. Throughout her career she has obtained ongoing education and certificates to support enhanced vision care for her patients including being a member of multiple professional associations.

Undergraduate Education: James Madison University. Optometry School: Southern College of Optometry. How are you impacting your local community or helping your patients live their best lives? I absolutely love doing specialty contact lens evaluations – there’s nothing like seeing a patient with poor vision light up once they get their scleral or gas-permeable contact lenses in! Hobbies/Interests: I love traveling, reading, good coffee shops, and spending time with my husband and our five children!

Dr. William Grovenburg earned his doctorate from Northeastern State University Oklahoma College of Optometry. He specializes in primary eye care for patients of all ages, focusing on helping them achieve optimal vision and long-term eye health. An active member of both the American Optometric Association and the Oklahoma American Optometric Association, Dr. Grovenburg stays current with the latest optometry advancements. He enjoys spending quality time with his spouse and two children outside the office. A passionate musician, he plays several instruments, including the mandolin (his primary instrument), piano, organ, bass, guitar, ukulele, and banjo.

Undergraduate Education: Worcester Polytechnic Institute; Bachelor of Science, Electrical Engineering. Optometry School: New England College of Optometry, 2008. Professional Achievements and Associations: American Optometric Association; New Hampshire Optometric Association. Clinical Certifications and Specialties: Dry eye specialist. The reason I became an optometrist is: I became interested in vision after doing a research project involving a protein like rhodopsin, a visual pigment molecule that ultimately helps us to see. Additionally, my father was a dentist. Having a parent in the health professions ultimately led me to consider optometry. My favorite part of helping my patients is: I really enjoy prescribing glasses or contact lenses for first-time wearers. That's when I feel that I have the greatest impact on the quality of their lives. By helping them to see, I can truly make a difference, especially with kids. I also enjoy helping to connect patients with other eyecare providers who provide services beyond just glasses and contacts. This includes referring in-house @ MED to optometrists who specialize in binocular vision disorders or specialty contact lenses, or even referring outside of MED to ophthalmology for cataract surgery. Ultimately, my job is to ensure that not only do my patients see their best, but for them to understand how ocular health impacts their vision. As primary care optometrists, we have a broad scope of practice that allows us to prescribe therapeutic pharmaceutical agents (TPAs) for several ocular conditions. It is our job to educate our patients about these conditions and prescribe when appropriate. In my spare time, I enjoy: spending time with my 2 year old daughter; reading; biking; traveling.

Undergraduate Education: SUNY Oswego Optometry School: New England College of Optometry Certifications/Awards: Clinical Honors every semester Hobbies/Interests: sports

Dr. Roxanne Guerndt graduated with a Bachelor of Biomedical Science from the University of South Florida. She then went on to receive her Doctorate in Optometry from Nova Southeastern University. In addition, she trained at Walter Reed National Military Medical Center and The Lake Nona Veterans Affairs where she helped manage a variety of ocular conditions. Dr. Guerndt is a member of the American Optometric Association and The Florida Optometric Association. During her free time, Dr. Guerndt is an avid health enthusiast and likes to spend her free time doing various activities such as running and biking. When not physically active, you may find this 5th-generation Floridian gardening, boating, or playing with her rescue kitten, Luna.

Undergraduate Education: Cedarville College; Optometry School: Salus University; Professional Achievements/Associations: AOA, MOA; What does providing a transformational eyecare experience mean to you? Ensuring the happiness and satisfaction of all patients; How are you impacting your local community? Church Trustee and Choir Member

Undergraduate Education: Susquehanna University. B.S. Biochemistry. Optometry School: The New England College of Optometry, 2001. Professional Achievements and Associations: American Optometric Association; Pennsylvania Optometric Association. The reason I became an optometrist is: I needed glasses at a young age and I always enjoyed going to my optometrist. He was very good at explaining all of tests and why they were needed. He made me feel comfortable and I thought that I could see myself doing the same thing. I absolutely love what I do and have never regretted my decision. My favorite part of helping my patients is: Getting to experience the moment when a person gets a new prescription or their first prescription and seeing their reaction to the improvement in their vision. In my spare time, I enjoy: Spending time with my family, playing board games, and enjoying a good book (with actual pages)!

Undergraduate Education: North Carolina State University. Optometry School: Southern College of Optometry. How are you impacting your local community or helping your patients live their best lives? I provide comprehensive eye exams to adults and children, including diabetic eye exams, contact lens exams, and ocular disease treatment and management. I also provide problem-based medical exams for conjunctivitis, inflammation related disease, traumatic injury, and more. Hobbies/Interests: Exploring with my three children, walking or biking on the greenways, and knitting.

Undergraduate Education: Nova Southeastern University: Bachelors in Biology; Optometry School: Salus University; Clinical Certifications and Specialities: I specialize in soft contact lens evaluations and glasses, as well as treating eye disease including macular degeneration, glaucoma, foreign body removals, eye infections, dry eyes, punctal plugs, and diabetic retinopathy. I became an Optometrist because I enjoy very much the patient doctor interaction optometrists have with their patients. I feel if I can just make one person's day better with a positive interaction then that is a successful day. I also enjoy very much examining patients eyes and having the ability to serve them by prescribing the correct eye glasses, contacts or medication to help better their vision and eye health. My favorite part of helping my patients is seeing them leave happy with the service I provided. In my spare time, I enjoy spending time with my family, traveling, being outdoors, especially near large bodies of water; lakes, rivers, ocean. I also enjoy watching movies and eating good food.

Undergraduate Education: Southwest Medical University, China; MD. Optometry School: New England College of Optometry, 1999. Professional Achievements and Associations: AOA/VAOA; ARVO; ASCRS/ASOA. Clinical Certifications and Specialties: Primary Eye Care. The reason I became an optometrist is: The desire to help people stay in optimal eye health. My favorite part of helping my patients is: Helping patients to improve the quality of life through better vision and health. In my spare time, I enjoy: Enjoy spending time with family, reading, traveling and music.

Undergraduate Education: Clemson University; Optometry School: University of the Incarnate Word Rosenberg School of Optometry; Professional Achievements/Associations: Gold Key International Honor Society, COVD, OEPF, AAO, AOA, and state association member; Clinical Certifications & Specialties: Residency trained in Pediatrics and Vision Therapy Rehabilitation at The Southern College of Optometry; What does providing a transformational eyecare experience mean to you? Ensuring the happiness and satisfaction of all patients.

Undergraduate Education: Bucknell University; Optometry School: Pennsylvania College of Optometry Clinical Certifications & Specialties: Primary care optometry; What drives your passion for optometry? I love working with patients and helping them. How are you helping patients live their best lives? It may be as simple as a new glasses prescription that helps them see better, or it could be managing an ocular disease. What does providing a transformational eyecare experience mean to you? It's important to really listen and care about the people that you're taking care of. How are you impacting your local community? I live in a small community and see a lot patients that I've seen and helped and I feel proud of that. Hobbies/Interests: Reading, swimming/exercising

Dr. Steven Guzik, Owner of Primary Eyecare Professionals, graduated from Loras College in May of 1994 with a Bachelor of Science Degree in Biology and a minor in Chemistry. He obtained his Optometric Degree from the Illinois College of Optometry in May 1998. While attending ICO, Dr. Guzik received the Southwest Contact Lens Society Scholarship. While working at the Wesley-Jessen Corporation, Dr. Guzik was an assistant clinical moderator for optometric students from the Illinois College of Optometry and Indiana University. He aided fourth-year optometric students with clinical decisions on diagnosing and treating ocular ailments. While at Wesley-Jessen, he obtained extensive knowledge and experience with several types of contacts and fitting techniques. In addition, Dr. Guzik has participated in contact lens workshops for third-year optometric students at the Illinois College of Optometry since 1999. He previously served as a clinical proctor with the National Board of Examiners in Optometry. As a proctor, his responsibility was to assess the clinical skills of fourth-year optometric students. He specializes in advanced contact lens fittings, myopia management, ocular disease cases, and pediatric optometry.

Dr. Angela Haas received her Doctorate of Optometry from the Southern College of Optometry. She has experience performing comprehensive medical and routine eye exams, contact lens fittings, pre- and post-op surgical care, and more at various clinics. A second generation Optometrist originally from South Carolina, Dr. Haas moved to Colorado after completing a rotation in Colorado Springs at the Air Force Academy during Optometry school. She is an active member of the Colorado Optometric Association and the American Optometric Association. During her schooling, Dr. Haas participated in the Student Volunteers in Optometric Services to Humanity, volunteering her time in Honduras, Jamaica, Mexico, and Colombia where she and her team saw over 4,000 patients. Dr. Haas prides herself on her positive attitude and delivers quality patient care with a smile. Her bubbly personality and passion for optometry make her a favorite of patients of all ages. Dr. Haas loves the Colorado live music scene and mountains. She also enjoys college football (specifically the Carolina Gamecocks), traveling, skiing (both water and snow), and is an active member of the volunteer organization Kiwanis International.

Undergraduate Education: St Mary’s University, Winona MN. Optometry School: Illinois College of Optometry. How are you impacting your local community or helping your patients live their best lives? I treat my patients as though they were all my family, I try to find the best solution to their ocular problems and improve their vision. Hobbies/Interests: Training my horses to ride and drive, managing my farm and livestock, craft work using all kinds of mediums, yarn, beads etc.