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.
By On 11/24/16 AT 7:54 AM. The release date of Ridley Scottâs âAlien: Covenantâ has been moved to an earlier date. Originally, the sequel to the 2012 chilling movie âPrometheusâ was scheduled to hit theatres on Aug. 4, 2017. Now, the movie, previously titled âPrometheus 2,â will release on May 19, 2017.