Skip to content

My prescription Find a doctor Browse Developers About

Compare two doctors

Now pick the second doctor

Calvin William Daack Optometrist · Fort Madison, IA

Second doctor

GlassScript

About How we compute things Common questions Watch a doctor Compare two doctors

Browse

By specialty By state By company By drug or device Is $X typical?

For professionals

Data API Embed a badge Monitoring

Trust

Accuracy & corrections For clinicians Privacy Terms

Data: CMS Open Payments, program years 2019-2025, as reported to CMS by drug and device makers (published June 30, 2026). Payments are legal and often routine: context on every page. GlassScript is independent and is not affiliated with CMS. Not medical, legal, or financial advice. Official source ↗