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.
A Dr. Wayne Bizer , Ophthalmology, answered on behalf of American Academy of Ophthalmology's EyeSmart. I suppose that it is possible to be allergic to almost anything. There are many brands and models of intraocular lenses used in cataract surgery today. Most of these IOLs are made of one of about four different materials (silicone, hydrophobic acrylic, hydrophilic acrylic, and PMMA).