I just bought a pair of large prescription sunglasses and was surprised the office didn't have a case large enough to hold them. After shopping around I came across these.  Not crazy about black, but the other cases that claim to be big don't actually give the dimensions so I went with this one.  Size is perfect, and I like hard cases vs. soft for prescription glasses of any type.  I just wish it came in a different color.  Nice case, though, lightweight and sturdy.