Why not wear your aviators AND enjoy reading while you are basking in the sun.  The sun aviator has a bifocal lens so you can look at the ocean and read a book with the same glasses!  Brown lens with tortoiseshell arms make these a standout sunglass design.
 
1.50 diopter bifocal lens
Brown Acetate lens is stronger and more durable than regular plastic frames
Spring Hinges allow for extreme comfort and flexibility without added pressure on varying head shapes and sizes