After 37 years, Carney received the Medal of Honor on May 23, 1900, for his heroism during the assault on Fort Wagner. When Carney died in 1908, the U.S. flag flew at half-mast at the Massachusetts State House. See the Library of Virginiaâs entry on William Harvey Carney.
Disadvantages. 1  Glass is the heaviest material used in the manufacture of lenses so eyeglasses with glass lenses will be the heaviest. 2  Thickness of the glass lenses: if you have large diopters lenses will be thicker. 3  Glass breaks easily: if you ride eyeglasses on the floor, you have a chance to run out of lenses.
Sunglasses consist of a pair of light-filtering lenses and a frame to hold them in place. The vast majority of lenses are made of colorized plastic, such as polycarbonate. However, glass is still employed for high quality brands. The highest quality lenses are optically accurate and do not distort shapes and lines.