It’s one of America’s fastest-growing companies.

RevolutionEHR, an electronic health records company focused on the eyecare industry, has racked up more than $45 million from an investor group since 2014.

The money comes from San Francisco-based RevOptix, the Wisconsin State Journal reports.

The amount was disclosed in documents recently filed with U.S. regulators, according to the newspaper.

The vast majority of the investment — about $40 million — came in 2014. A few million, however, rolled in just recently.

RevolutionEHR has for several years been one of the Inc. 5000 fastest-growing companies in the U.S. In 2015 it had revenue of $10.7 million.

Read more at the Wisconsin State Journal