John Rawls. John Bordley Rawls (21 February 1921 â 24 November 2002) was an American philosopher,and a leading figure in moral and political philosophy. He held the James Bryant Conant University Professorship at Harvard University and the Fulbright Fellowship at Christ Church.
Hazel eyes have a higher concentration of melanin (pigment) around the eye's border, which can result in a multi-colored appearance that varies between copper and green depending on the lighting. Most people estimate that around 5-8% of the world's population has hazel colored eyes. Blue eyes are genetically recessive, and therefore much less common worldwide. Blue eyes are formed by the absence of pigments in the eye, where the blue color is formed by the scattering of light as it's reflected off the iris.
For example, findings from the 2015 National Health Interview Survey (NHIS) data release established that an estimated 23.7 million adult Americans (or 10% of all adult Americans) reported they either have trouble seeing, even when wearing glasses or contact lenses, or that they are blind or unable to see at all.