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Meet the Staff

At Baseline Vision Clinic, our eye doctors and staff are friendly and professional. Our commitment is to provide exceptional service to all of our patients. We take pride in our personalized care and strive to spend the necessary time with each person to ensure a comfortable experience.

Our optometry professionals are passionate about providing high-quality care to our family of patients. We focus on providing comprehensive eye exams, a large selection of fashionable eyewear, and the best possible vision and eye health care. Call us today to make an appointment.

  • Joan Ploem Miller
    Optometric Physician

    Dr Joan Ploem Miller moved to Hillsboro, Oregon when she was 5. She became interested in the field of Optometry at 14 when she first learned she was near sighted. She has dedicated her life to giving the local Hillsboro area patients the best eye care possible. After receiving her bachelor’s degree in Visual Science, Dr Miller went on to complete her Optometry Doctorate with distinction at Pacific University College of Optometry in 1979. She was named Oregon Optometrist of the Year in 2002. Having seen patients for four decades and staying up-to-date with technology and research, she takes care of your eyes like they were her own. She has been a leader in optometry serving on the Oregon Board of Optometry for 13 years and was President for 7 years. She also helps the National Board of Examiners in Optometry write the tests optometrists take prior to practicing optometry.

  • Sarah Olmschenk
    Optometric Physician

    Dr. Sarah Olmschenk has been interested in eyes and optometry ever since grade school. She received her first pair of glasses in fourth grade, and has been motivated to give the gift of clear vision to others ever since. Dr. Olmschenk grew up on a farm in rural Minnesota and received her undergraduate degree from Minnesota State University Moorhead. She then traveled to Pacific University College of Optometry to obtain her doctorate degree in optometry, graduating with distinction in 2006. Dr. Olmschenk has completed a series of clinical internships in numerous facets of optometry, including family practice, vision therapy, and ocular disease. She particularly enjoys examining infants and young children; early eye exams are key to preventing serious problems later. Dr. Olmschenk has a young daughter and son of her own, and loves every minute spent watching them grow up.

  • Sam Huffman
    Office Manager

    Sam is our Office Manager and is your go-to guy for insurance and billing challenges. With many years of experience in the eye care field he is also a skilled optician. He can adjust your eyewear or help you become proficient with contact lenses. His other hats include being a certified Diopsys Nova electrophysiology technician. Sam attended Oregon State University but tries hard to be nice to Duck fans as well as Beavers. He enjoys fishing, sports, riding his motorcycle and his cat Batman.

  • Linda Coe
    Assistant Office Manager

    Linda is our assistant office manager. She joined our office in 2013 after years of experience as a major bank customer service manager. With her years of dedication, she works to make every aspect of your visit to our office enjoyable. Linda is patient and kind and the perfect person to help you get the most from your insurance as well as helps you understand your responsibilities. When not helping people, Linda enjoys keeping up with her two young children outside of the office.

  • Sarah Hering-Washington
    Dispensing Optician

    Sarah is truly an optician extraordinaire. She has vast optical experience and loves finding the perfect eye wear for you and considers glasses “jewelry for your face.” She has been a dispensing optician since 1997. She comes from an eye care family (grandpa was Dr. Miller’s optometry professor) and has worn glasses since she was a toddler. Since her prescription is strong she is especially good at making complicated prescriptions look great. She easily explains your options, keeping your budget in mind, and helps you find your style. Sarah is very artistic and stylish. She graduated from Portland State University with a degree in psychology. Outside the office she loves spending time with her husband and their children.

  • Maritza Perez-Garcia
    Patient Coordinator

    Maritza is usually the first person to answer the phones or greet you when you come to our optometry office. She genuinely enjoys people and will make you feel welcome. You will appreciate her competence when she schedules your appointments or relays information to the doctors and our eye care team. She is fluent in Spanish and gladly provides translation services. Maritza graduated from Eastern New Mexico University with a BS in Criminal Justice. In her free time she enjoys hiking and spending time with family.

  • Olga Merecias
    Optometric Technician

    Olga is our lead optometric technician. She joined our office in 2011 with many years of customer service experience with a major bank. She is skilled with all our high-tech equipment and has the perfect personality to help patients feel at ease. She received special training to obtain both paraoptometric and paraoptometric assistant certifications. A graduate of Diopsys University, she is our lead electrophysiology tech performing ERG and VEP Vision Testing. She also provides translation services for our Spanish-speaking eye care patients. In her free time, Olga enjoys being mom to her young son and spending time with family.

  • Jerry Zhu
    Optometric Technician

    Jerry is a computer guy who has transformed his technical experience from machines to caring for patients. Joining our eye care team in 2017 as an Optometric Assistant/Scribe, he has already finished training as an Optometric Technician and is NOVA certified by Diopsys. His warm and funny personality makes patients feel at ease and enjoy the eye exam experience. Jerry graduated from University Of Oregon with a Human Physiology degree. Out of the office he enjoys music and backpacking the Pacific Northwest.

  • Peggy Ploem
    Financial Officer

    Peggy is our longest standing employee. Starting in 1979 she has served in many different roles. Her primary responsibilities are payroll, accounts payable, banking, post office and dealing will taxes. She also alters scrubs, provides financial and other counseling services to staff and is mom to Dr Miller. In her free time she teaches three knitting classes, knits helmet liners for our troops and is active at the Old Scotch Church.

  • Peggy Jean Moore

    Peggy Jean is our trusted behind the scenes assistant. She uploaded three decades of paper charts and made them easy to access electronically. She continues to upload records and invoices to make us efficient. She is a master quilter, avid reader and enjoys travel.

Contact Us

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Hours of Operation

Hillsboro Office


8:00 am-5:00 pm


8:30 am-5:00 pm - Evenings until 7:00 pm by appointment.


8:00 am-5:00 pm


8:30 am-5:00 pm


8:30 am-5:00 pm


Closed - Medical eye emergencies call or text (503) 730-2007 or (503) 628-9273


Closed - Medical eye emergencies call or text (503) 730-2007 or (503) 628-9273