Doctor & Staff


Dr. Prell grew up on a hobby farm in the small community of Cumberland, Wisconsin, and graduated from UW-River Falls with a bachelor’s degree in biology in 1974. He then attended and graduated from the Illinois College of Optometry with a bachelor’s degree in visual science as well as a doctor of optometry degree in 1978. He was an associate optometrist in a private practice in Rhinelander for one year after graduation. During that year he searched for a private practice where he could practice solo, and it became profoundly obvious that Reedsburg was the place to start a new practice and raise a family. He has two children, Emily and Adam, who are now adults and live in southern Wisconsin. He is also a proud grandpa to two young boys. During his career, Dr. Prell has served for many years as a director and officer on the board of the Wisconsin Optometric Association, and he is a member of the American Optometric Association. He has also been active in church and local community boards. His hobbies include outdoor activities such as hunting, snowmobiling, maintaining deer food plots, and playing with his grandkids.



In January 2015, Dr. Christine Renner began seeing patients at Dr. Prell’s office on Mondays. She also sees patients at another optometric office the remainder of the week. Dr. Renner is a 1996 honors graduate of the University of Wisconsin – Platteville and a 2000 honors graduate of the Illinois College of Optometry. Dr. Renner is a member of the Gold Key International Optometric Honors Society and Beta Sigma Kappa International Optometric Honors Society. She is a member of the American Optometric Association and the Wisconsin Optometric Association. She serves as the WOA’s South Central Society president and Education Committee chair. She enjoys running, biking, teaching Sunday school and traveling with her husband Chris.



Bethany has worked for Dr. Prell since October 2000. She is an ABO certified optician and serves patients in the dispensary, fitting patients with glasses as well as contact lenses. She also assists with visual field testing and retinal photography.


Cindy joined Dr. Prell’s office team in 2010. She answers incoming calls and makes the appointments for our office. She takes care of all aspects of insurance claims and billing. She also verifies insurance and confirms appointment prior to the patient’s appointment date.


Kasandra Clark joined our team in April of 2017.  She aids in the preparation of patients’ charts and making sure all information is correct prior to your visit for an easy and enjoyable experience.   She also assists in general office duties such as answering incoming phone calls, pulling charts, retinal photography, as well as notifying patients when glasses or contacts are here.  Her smile will be there to greet you for your very first appointment or your one-hundredth visit.


Katy Sass joined our team in March of 2018.  She has been handling patient pre-testing, which includes visual acuities and other various vision tests prior to seeing the doctor.  She also prepares charts and assists with other everyday office duties.  Her warm and bubbly personality has been an asset to our team.