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The Prismatic World Tour was the third concert tour by American singer Katy Perry, in support of her fourth studio album, Prism (2013). The tour began on May 7, 2014, at Belfast, Northern Ireland's Odyssey Arena and ended on October 18, 2015, at Alajuela, Costa Rica's Parque Viva after six legs. [2]
The prism fusion range (PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists, optometrists, and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision in the presence of increasing vergence demands.
A pentaprism. A perspective drawing showing a roof pentaprism commonly used in a single lens reflex camera (SLR). The image is flipped laterally by the prism. A pentaprism is a five-sided reflecting prism used to deviate a beam of light by a constant 90°, even if the entry beam is not at 90° to the prism.
To avoid double vision from non-corresponding points, the eye with the prism must move up or down, following the image passing through the prism. Likewise conjugate torsion (rolling) on the anteroposterior axis (from the front to the back) can occur naturally, such as when one tips one's head to one shoulder; the torsion, in the opposite ...
Two of the FVEY information collection mechanisms are the PRISM program and the Upstream collection system. The PRISM program gathers user information from technology firms such as Google , Apple , and Microsoft ; while the Upstream system gathers information directly from civilian communications as they travel through infrastructure like fiber ...
Brent Weeks (born March 7, 1977) is an American fantasy writer. His debut novel, The Way of Shadows, was a New York Times best seller in April 2009. [1] [failed verification] Each of the five books in his Lightbringer series made the NYT list as well, starting with The Black Prism in 2010.
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