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Doctors & Staff

Meet the experienced and friendly doctors and staff who make Summit Eye Clinic the leading provider of vision care products and services in Oconomowoc.

Randy J. Prestash, O.D.

Dr Randy PrestashDr. Randy J. Prestash, the Founder and Senior Clinician of Summit Eye Clinic, is a Wisconsin native from West Allis. After graduation from the University of Wisconsin, Milwaukee, he attended and graduated from Illinois College of Optometry in 1980. While serving at the Eye Institute of Illinois in Chicago, Dr. Prestash received awards for research and clinical care serving newborn pediatrics and special needs patients. After graduation, he and his wife, Patricia, his high school sweetheart, an attorney graduate of Northwestern Law School, established four private practices in Milwaukee, New Berlin, Brookfield, and currently Oconomowoc, Wisconsin. Dr. Prestash has published, received awards and recognition in Who’s Who, Outstanding Young Men in America, Rotary International, Top Optometrists in America, and the Wisconsin & American Optometric Associations while serving as a National Board Examiner in Optometry. Dr. Prestash and Summit Eye Clinic have been honored to be selected to join the Vision Source National Network of Premier Private Practices.
Dr. Prestash is fluent in Spanish, he has led and contributed to numerous International Medical Eye Care Missions as he traveled to over 31 countries. He and his wife Patricia, contribute support for five children through Compassion International, and they plan to establish eye care programs in each of the five countries where their sponsored children reside. In his spare time, Dr. Prestash enjoys composing and playing music on the piano, guitar, harmonica and european accordion. He also loves photography, painting, woodworking, fishing, classic cars and international travel. “My life is filled to the brim with the blessings of a wonderful family, thousands of patients and friends, and more to do than time will ever allow!”

Dana McGuire, O.D.


Dr. Dana McGuire, nee Eng, was born and raised in the Lake Country area.  After graduating Magna Cum Laude from the University of Wisconsin — Green Bay, she moved to Bloomington, Indiana to attend Indiana University School of Optometry. During her professional training she served as an Assistant Instructor for several courses and was awarded the prestigious Silver Medal from the Beta Sigma Kappa International Optometric Honor Society. She graduated first in her class, with Highest Honors, in 2006. Dr. McGuire has served patients in several offices in Pewaukee and West Allis, Wisconsin before joining Summit Eye Clinic in 2015. She is a member of the American and Wisconsin Optometric Associations.

While providing exceptional eye care is a must, Dr. McGuire also believes excellent patient communication and education are equally important. strive to make sure my patients understand their condition so they can be an active participant in their eye and health care.” Dr. McGuire enjoys seeing patients of all ages for routine care, as well as, managing ocular diseases.

Dr. McGuire met her husband, Ryan, while in high school and they were married in 2003. They currently reside in Hartland with their two young daughters, Aubrey and Kylie.  In her free time Dr. McGuire enjoys spending time with her family, reading, traveling, crocheting, and volunteering at her daughters’ schools.