who created the first seamless bifocal a precursor to all progressive lenses
Bifocals In 1955, Irving Rips of Younger Optics created the first seamless or "invisible" bifocal, a precursor to all progressive lenses.[2]
Paris Peace Accords
Economic nationalism While the coining of the term "
En plein air Artists have long painted outdoors, but in the mid-19th century, working in natural light became particularly important to the Barbizon school, Hudson River School, and Impressionists.