Our Doctors

content_mannenDr. Daniel Mannen, O.D., F.A.A.O.

Dr. Daniel Mannen has been serving the eye care needs of Columbia County for over 27 years. Dr. Mannen brings a very distinctive down home style of patient care and is a people person who really enjoys interaction, education, and making a special connection with his patients. Dr. Mannen has had extensive training in ocular disease and brings special expertise in managing the ocular and systemic ramifications of diseases such as: diabetes, systemic hypertension, glaucoma, cataract, and macular degeneration. With state of the art, high tech equipment to aid in the detection and management of ocular disease, patients can expect a comprehensive evaluation of their eyes and visual system combined with a thorough application of those findings to their general health.

Originally from eastern Oregon, Dr. Mannen received his degree in optometry with high honors from the Pacific University College of Optometry in Forest Grove. Dr. Mannen began his career at Balboa Naval Hospital in San Diego, California.

Dr. Mannen has served as President of the Oregon Optometric Physicians Association, and is a Fellow of the American Academy of Optometry. He also serves on the Board of Directors of VSP, the largest vision care company in the world in which he was Chairman of the Board of Directors from 2006-2008.

Dr. Mannen is a resident of St. Helens and in his free time he enjoys spending time with his wife and two children. He is an avid golfer and is also active in his local church, serving in church leadership for many years.


content_lenayeeDr. Lena H. Walker, O.D.

Dr. Lena Walker has been a dedicated professional within our practice for the past twelve years. She is warm, friendly and caring, and able to address the vision and medical needs of all ages. She is experienced at treating a wide range of eye diseases and conditions including glaucoma, cataracts, macular degeneration, and diabetic retinopathy. With an emphasis on specialty lenses for astigmatism, multifocal and rigid contact lenses, Dr. Walker will meet all of your spectacle and contact lens needs.
Originally from Hawaii, Dr. Walker received her bachelors degree at the University of Washington in Seattle. She then moved to Oregon where she received her degree in optometry with honors at the Pacific University College of Optometry in 2000.

Dr. Walker is an active member of the American Optometric Association as well as the Oregon Optometric Physicians Association. While at Pacific University, she received the Vistakon Award of Excellence in Contact Lens Patient Care. And, for the last three years, Dr. Walker has been honored with a Spotlight Readers Choice Award.

Dr. Walker enjoys spending time with her husband and kids. She also makes time to volunteer at her childrens’ school. She loves to travel, enjoys photography, and teaching sewing and baking to her daughters.


content_TomC1Dr. Tom Chewerda, O.D.

Dr. Tom Chewerda is the latest addition to our practice. Pleasant, easy going and full of compassion for others, he maintains a positive outlook with a light sense of humor. Dr. Chewerda is experienced in the management of a wide variety of eye diseases such as diabetic retinopathy, glaucoma, cataracts, and dry eye syndrome. With an emphasis on ocular health assessment, specialty contact lenses and pediatric vision care, Dr. Chewerda is eager to meet the eye care needs of Columbia County’s residents.

Originally from North Dakota, Dr. Chewerda received his bachelors degree at Pacific University in Forest Grove. He received his degree in optometry at Pacific University’s College of Optometry.

Dr. Chewerda is a member of the American Optometric Association, Oregon Optometric Physicians Association, and the Portland Metropolitan Optometric Society.
Dr. Chewerda enjoys spending his free time with his wife and newborn daughter, and enjoys playing tennis, snowboarding, and cooking.