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Doctors & Staff

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


Dana S. McGuire, OD

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.  She is a member of the American and Wisconsin Optometric Associations.  Dr. McGuire served patients in several offices in Pewaukee and West Allis, Wisconsin before joining Summit Eye Clinic in 2015.  In 2019, Dr. McGuire became the new owner of Summit Eye Clinic and looks forward to a long future in the Oconomowoc community.

Dr. McGuire was voted #1 Eye Care Practitioner in Lake Country Family Fun’s 2020 guide of top healthcare providers in Lake Country. While providing exceptional eye care is a must, Dr. McGuire also believes excellent patient communication and education are equally important. “I strive to make sure my patients understand their condition so they can be active participants in their eye and health care.” Dr. McGuire enjoys seeing patients of all ages for routine care and contact lens fits, as well as, treating 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 grade school aged daughters, Aubrey and Kylie.  In her free time Dr. McGuire enjoys spending time with her family, reading, traveling, cycling, crocheting, and volunteering at her daughters’ school.


Randy J. Prestash, O.D.

Dr. Randy Prestash, the founder 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, established four private practices in Milwaukee, New Berlin, Brookfield, and currently Oconomowoc, Wisconsin. Dr. Prestash has received awards and recognition in Who’s Who, Outstanding Young Men in America, Rotary International, and Top Optometrists in America, while also serving as a National Board Examiner in Optometry.  He is a member of the American and Wisconsin Optometric Associations.

Although Dr. Prestash formally retired in August of 2020, you may still see him around the office from time to time.