About Us

Who We Are

The leading provider of quality vision care products and personalized optometric services in Greensboro and Oak Ridge.

Since 2003, Vision Source Eye Center of the Triad has been the leader and preferred provider of quality vision care products and personalized optometric services to our patients in Greensboro and the surrounding areas. Our experienced doctors and staff offer comprehensive vision examinations and specialize in the diagnosis and treatment of a wide array of eye diseases, conditions, and problems.
In our mission to provide the best eye care services possible, our doctors use only the most advanced, state-of-the-art diagnostic technology and eye care products available. We are committed to educating our patients and providing personalized eye care services to the people of Greensboro and Oak Ridge. At Vision Source Eye Center of the Triad, you will find eye care professionals who genuinely care about your health and are dedicated to providing exceptional personal service to everyone who walks through our door.
Schedule an appointment with our doctors at our Greensboro and Oak Ridge optometrist office and give your vision the level of care and attention it deserves.

Our Staff

Meet the experienced and friendly staff who make Vision Source Eye Center of the Triad the leading provider of vision care products and services in Greensboro and Oak Ridge.

Timothy Koop, O.D.

Timothy Koop, O.D.
Dr. Koop earned his Doctor of Optometry degree from the Illinois College of Optometry in 1996. Prior to this, he attended Calvin College in Grand Rapids, Michigan for his undergraduate studies. In addition, he also received a Bachelor of Science degree in Visual Science. Dr. Koop’s clinical training included rotations at the Illinois Eye Institute as well as various externship sites throughout Chicago. He enjoys practicing all aspects of Optometry including pediatric and geriatric exams and advanced corneal refractive therapies.

Prior to practicing in Greensboro, NC, Dr. Koop practiced in Saginaw, Michigan, and Wilmington, NC. In 2000, he joined Eye Care Associates at their Greensboro location. In January 2003, he and his wife, Dr. Angela Martinek, purchased the Greensboro and Oak Ridge practices and renamed it Vision Source Eye Center of the Triad. They then relocated the practice to its current location in November 2008.

Dr. Koop resides in Greensboro with his wife Angela, daughter Carly and son Sam. He was born and raised just outside of Grand Rapids, Michigan. He enjoys almost any type of sporting activity, most notably golf and basketball. He also enjoys following all his Michigan sports teams when possible.
Timothy Koop, O.D.

Angela Martinek, O.D.

Angela Martinek, O.D.
Dr. Angela Martinek grew up in Greensboro, NC, where she attended both grade school and high school. She received her Bachelor of Science degree in Zoology from North Carolina State University in 1992. She attended Illinois College of Optometry in Chicago where she received her Doctor of Optometry and Bachelor of Science in Visual Sciences degrees in 1996.
After graduating, Dr. Martinek worked in the Saginaw area in Michigan and then in Wilmington, NC. She moved to Greensboro in 2000 and has been in private practice since. She and her husband, Dr. Timothy Koop, own Vision Source Eye Center of the Triad.
Dr. Martinek lives in Greensboro with her husband Tim, daughter Carly and son Sam. She enjoys following sports, especially NC State football and basketball and is an avid Chicago baseball fan.
Angela Martinek, O.D.

Josef Silverman

Josef Silverman

Administrator / Optician 

Josef joined Vision Source Eye Center of the Triad in January 2017 and has over 35 years of expertise in the optical industry. Josef is originally from Savannah, Georgia. He and his wife, Carol, along with their three children have lived in Greensboro since 1990. In his spare time, Josef enjoys spending time with his family, cycling, and reading.

Josef Silverman

Karen Leatherwood

Karen Leatherwood
Insurance / Billing Specialist
Karen joined Vision Source Eye Center of the Triad in September 2014 as the Insurance/Billing Specialist. Karen brought with her 20 years of customer service and insurance experience in Optometry. She relocated from Kinston, NC in 2005 to be closer to her daughter and family, which includes her favorite pastime of spoiling her 2 rambunctious grandsons. She also loves to get away to the beach occasionally for relaxation and fun.
Karen Leatherwood

Lisa McCarville

Lisa McCarville
Front Desk Coordinator
Lisa joined Vision Source Eye Center of the Triad in November 2015 with over 20 years of management experience. Lisa was raised in both Nashville, TN and sunny South Florida and now resides in Greensboro with her family. In her spare time, Lisa enjoys reading, hiking, photography and collecting vinyl record.
Lisa McCarville

Tiffany Coleman

Tiffany Coleman
Optometric Technician
Tiffany joined Vision Source Eye Center of the Triad in November 2019 with over 2 years of experience as an Optometric Technician. Having a background in customer service and healthcare, her favorite part of the her job is connecting with people. Originally from New Jersey and South Carolina, Tiffany resides in Greensboro with her husband, Brian. When she is not at work she loves to travel, spent time with her family, and work on her photography.
Tiffany Coleman

Christine Wilkison

Christine Wilkison
Optician
In 2019, Christine joined the Vision Source Eye Center of the Triad team, contributing 6 years to the optical industry and a profound sense of customer service. Christine is originally from the Boston area and has lived up and down the east coast, all the way out to Minneapolis and the mid-west for a brief time. She enjoys travel, different cultures and is a major foodie. As an animal lover, She is a proud mom of two fur babies, her cat Storm and her Goldendoodle Thor. Christine is a Capricorn that enjoys hiking, dancing, karaoke and fine dining when she is not in the office. She also has done acting and performance monologues. Be sure to say hi to Christine while you are visiting our office, she is always more than happy to help you with your optical needs.
Christine Wilkison

Annette Staudinger

Annette Staudinger

Optometric Technician
Annette hails from Beloit, Wisconsin. As a Dean Scholar, she studied Molecular Biology at the University of Wisconsin-Madison. After earning a Bachelor of Science in Visual Science and Doctor of Optometry at The Illinois College of Optometry, Annette worked with Lenscrafters, Sterling Optical, Eye Exam 2000, Jessen & Wesley, Lawrence Family Optical, and Charlotte Eye, Ear, Nose, and Throat. She loves to go on great adventures with her husband, Rob, and their two sons, Ricky and River. They love to bring along their polar white lab, Cooper, and their bossy Maltese, Mali. Musical theater, travel, photography, and glamping are her favorites.

Annette Staudinger

Kesha Witten

Kesha Witten
Ophthalmic Technician
Kesha joined Vision Source Eye Center of the Triad in May 2020 with over 20 years of experience as an Ophthalmic Technician, assisting in surgery and also working in optical. She relocated from West Virginia in 2020 and now resides in Greensboro with her husband. When she is not working, she spends her free time reading and enjoying her family.
Kesha Witten

Sheri Sanvitale

Sheri Sanvitale
Optometric Technician/Dry Eye Consultant
Sheri joined Vision Source Eye Center of the Triad November 2020 as an Optometric Technician/Dry Eye Consultant, specializing in our Low Level Light Therapy and TempSure Treatments. She has a medical background certified as an EMT and a Phlebotomist since 2019. She relocated from Long Island, New York in 2014 and now resides in Greensboro with her family. When she is not at work she enjoys traveling, cooking, and painting.
Sheri Sanvitale

Shakia Fields

Shakia Fields
Optometric Technician
Shakia joined Vision Source Eye Center of the Triad in January 2021 as an Optometric Technician. She is from Belhaven, NC and has lived in Greensboro, NC since 2009. Shakia has experience in Customer Service as well as being an Optometric Technician and Traveling Retinal Imaging Technologist. She studied Public Health at The University of North Carolina at Greensboro with a minor in American Sign Language. She is currently the Auxiliary Coordinator for the marching band at T.W. Andrews High School. In her spare time, Shakia likes to spend time with family and friends, travel, go to the beach, try new food and invest.
Shakia Fields

Patti Leonard, ABO.

Patti Leonard
Optician
Patti joined Vision Source Eye Center of the Triad in September 2020 with over 22 years experience in opticianry. Working with patients is a great pleasure for her. During time off from work, she enjoys gardening and going to her “happy place”, The Beach.
Patti Leonard

Sarah Schallar

Sarah Schallar
Sarah joined the Vision Source Eye Center of the Triad team in February 2021. She moved to Greensboro in May 2020 and loves meeting fellow Ohio transplants. In her free time, she enjoys reading, playing online games with her friends, and spending quality time with her long term boyfriend and cat, Lily. She has long term dreams of eventually living in Florida on the beach with them.
Sarah Schallar