
Thorough Eye Exams for Healthy Vision
At Dr. Korthals & Associates, your healthy vision is our top priority. We strive to empower our patients with the knowledge and tools they need to maintain their eye health for years to come.
That’s why we provide thorough eye exams using diagnostic technology, like OCT and retinal imaging, to get a clear picture of your eyes and their overall health. Our team supports you in maintaining healthy eyes and managing conditions such as dry eye, AMD, and others.
We’re proud to offer 2 locations to serve our communities of North Central Iowa.

Visit Our North Central Iowa Eye Clinics
With 2 convenient locations in North Central Iowa, we are happy to serve Cerro Gordo, Winnebago, Floyd, Hanock, and Kossuth Counties, and beyond.
Mason City
We’re located on South Pierce Avenue near the 4th Street SW intersection and across from Walgreens.
- 422 S Pierce Ave
- Mason City, IA 50401
Hours of Operation
- Monday: 8:00 AM – 6:00 PM
- Tuesday: 8:00 AM – 6:00 PM
- Wednesday: 8:00 AM – 6:00 PM
- Thursday: 8:00 AM – 6:00 PM
- Friday: Closed
- Saturday: Closed
- Sunday: Closed
Lake Mills
Find us on West Main Street between Mill Street and Washington Street.
- 213 W. Main
- Lake Mills, IA 50450
Hours of Operation
- Monday: Closed
- Tuesday: 8:00 AM – 5:00 PM
- Wednesday: Closed
- Thursday: Closed
- Friday: Closed
- Saturday: Closed
- Sunday: Closed
Our Eyewear Brands








Our Blogs
Your Eyes In The Digital World
Eye Health and DiseasesIt’s no secret we live in a very digital world and use digital devices throughout the day. While we cannot escape exposure to digital devices and blue light, it is important to know how our eyes are affected by our changing technological environment. […]
Protecting Your Eyes in Every Season
Eye Health and DiseasesThere are many things we need to protect our eyes from all year round, including allergies, dry eye, and harmful UV rays. Each of these could affect your eyes any day of the year. Take a look at these tips for protecting your eyes so you can stay allergy-free […]
6 Common Eye Symptoms and What to Do
Eye Health and DiseasesSuffering from eye discomfort or blurry vision can be scary, especially if it comes on suddenly or is a result of a dramatic event. Below are some of the common eye-related disorders. However, remember that common doesn’t mean it should be ignored. […]
Your Eyes In The Digital World

It’s no secret we live in a very digital world and use digital devices throughout the day. While we cannot escape exposure to digital devices and blue light, it is important to know how our eyes are affected by our changing technological environment. […]
Protecting Your Eyes in Every Season

There are many things we need to protect our eyes from all year round, including allergies, dry eye, and harmful UV rays. Each of these could affect your eyes any day of the year. Take a look at these tips for protecting your eyes so you can stay allergy-free […]
6 Common Eye Symptoms and What to Do

Suffering from eye discomfort or blurry vision can be scary, especially if it comes on suddenly or is a result of a dramatic event. Below are some of the common eye-related disorders. However, remember that common doesn’t mean it should be ignored. […]