Doctors & Staff

FullSizeRender(5)Dr. Dan Caldwell

Dr. Caldwell is a native born of Portland, Oregon.  He attended local schools and after high school went on to receive a Bachelor of Science from Oregon State University in Microbiology.  He later received a second Bachelor of Science in Visual Science and his Doctor of Optometry degree from Pacific University.  He began private practice in Sandy and Gresham, establishing Sandy and Gresham Vision Centers in 1988 and 1990.

Dr Caldwell enjoys hiking, skiing, sailing, camping, is an avid cyclist and enjoys spending time with his wife and children.


IMG_1464Dr. Brett Agost

Dr. Agost enjoys getting to know his patients while serving the eye care needs of a tight-knit community like the one he grew up in. He was raised in Roseburg Oregon where he was a three-sport athlete in high school. He went on to play basketball at Western Oregon University and graduated with a degree in education. He began a career in teaching and coaching before choosing to follow his father into Optometry. He graduated from Pacific University College of Optometry in 1993 and began practice in his hometown of Roseburg. In 1997, he and his wife Dalene moved to Gresham where he began practice at Gresham Vision Center and Sandy Vision Center with Dr. Caldwell. Dr. Agost enjoys providing quality eye care for his patients in the Gresham and Sandy communities. His scope of practice includes primary eye care ( including treatment and management of ocular disease, such as eye infections, macular degeneration, glaucoma and diabetes), as well as refractive services for glasses and contact lenses. Dr. Agost cares for many patients with cataracts and is licensed to perform pre and post operative care for eye surgeries such as cataract surgery and lasik surgery. Dr. Agost is also an active member of the Oregon Optometric Physicians Association. When not at work, He enjoys spending time with his wife Dalene and their three children in a busy sports family.


Dr. Karen Truong

Dr. Karen Truong graduated from University of Oregon and completed her Doctor of Optometry with honors from Pacific University. Dr. Truong practices primary care optometry, which includes prescribing contact lenses and glasses, treatment and detection of eye diseases such as glaucoma, diabetic retinopathy, and macular degeneration, and co-management of LASIK and cataract surgeries. She listens to all your individual needs, and will explain the findings and recommendations in a way that is easy to understand.

Dr. Truong is a Portland native and remains active in the community. She is a member of Kiwanis Club, which is a service organization that helps children in the Sandy area. She is multilingual in English, Cantonese Chinese, and Spanish. In her free time, she enjoys traveling, hiking, cheering for the Blazers, and finding the next restaurant or bakery to try.


Our Staff

The staff at our offices are well trained and focused on making your patient experience a personal one.  All members of our staff attend continuing education classes throughout the year in areas of spectacle lenses, contact lenses and eyewear design.

The office culture at our offices is one of excellence in patient care and personalized service. We believe and practice doing the right thing to make your experience a good one with long lasting happiness, eye health and optimal vision.


FullSizeRender(1)Becky – Sandy Office

Front desk Coordinator/Optician


FullSizeRender(2)Denise – Gresham Office

Optometric Assistant/Optician


FullSizeRender(4)Diane – Gresham Office

Office Manager


FullSizeRender(6)Lori – Sandy Office



IMG_1473(2)Carrie – Gresham Office

Optical Manager


IMG_1482Barbara – Gresham & Sandy Offices



Brandy – Gresham & Sandy Offices

Insurance Coordinator/Front Desk

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