The refractive index of current eyeglass lens materials ranges from 1.498 (CR-39 plastic) to 1.74 (a specific variety of high-index plastic). So for the same prescription power and lens design, a lens made of CR-39 plastic will be the thickest lens available, and a 1.74 high-index plastic lens will be the thinnest.
Principal photography on the film began on April 25, 2016, in Pittsburgh, Pennsylvania, in the Hill District, and wrapped in mid-June 2016. Fences was released in the United States on December 16, 2016, by Paramount Pictures, received positive reviews and grossed $64 million.
Wilson has taken upon himself the responsibility to write a play about black experiences in the United States for every decade of the 20th century. Only two decades remain, the first years of the century and the 1990's. Fences is his play about blacks in the 1950's.Beginning in 1957, between the Korean and Vietnam wars, Fences ends in 1965, but the themes of the play directly place its consciousness in a pre-civil-rights-movement, pre-Vietnam-war-era psyche.ugust Wilson was named Frederick August Kittel when he was born to a German father and an African American mother in 1945. Wilson was born and raised in Pittsburgh, PA. His father drifted in an out of his family. His mother and a stepfather, David Bedford, mostly raised Wilson.