French ophthalmologist
Kalt
Eugène Jean Baptiste Kalt was a French ophthalmologist who developed the first known application of a contact lens for the correction of keratoconus.
In 1888, he worked on a crude flat-fitting glass scleral lenses designed to "compress the steep conical apex thereby correcting the condition". His first lenses were crafted from the bottoms of glass test tubes.
Text adapted from Wikipedia, CC BY-SA 4.0.