Welcome to Dr Korthals and Associates, where we strive to provide our patients with the highest quality eye care in a family based setting. We maintain the most advanced technology and equipment available to ensure your best possible outcome.

Our goal at Dr. Korthals and Associates is to provide much more that just glasses and contact lenses, but to preserve your eye health which will enhance your lifestyle.


Mason City Location
422 South Pierce
Mason City, IA 50401
p. 641.424.0780
f. 641.424.2345
Lake Mills Location
213 W. Main
Lake Mills, IA 50450
p. 641.592.1801
MONDAY 8am - 5pm
TUESDAY 8am - 5pm
WEDNESDAY 8am - 5pm
THURSDAY 8am - 5pm
FRIDAY 8am - 5pm