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.
On December 16, 2013, Summit Entertainment announced that the film adaptation of Allegiant would be released on March 18, 2016. On April 11, 2014, Lionsgate announced that the film adaptation would be split into two films with the first part titled, The Divergent Series: Allegiant â Part 1.