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Like other lenses for vision correction, aspheric lenses can be categorized as convex or concave. Convex aspheric curvatures are used in many presbyopic vari-focal lenses to increase the optical power over part of the lens, aiding in near-pointed tasks such as reading. The reading portion is an aspheric "progressive add".
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]
An ideal trial frame have minimum 3 cells, one each for holding spherical lens, cylindrical lens and other tools like occluder or pinhole. [4] Angle for axis of astigmatism is marked on outermost visible cell There are knobes to adjust pupillary distance, side angle, height and cylindrical lens axis. [5]
The Massachusetts Correctional Institution—Cedar Junction (MCI-Cedar Junction), formerly known as MCI-Walpole, is a mens maximum security prison under the jurisdiction of the Massachusetts Department of Correction. It was opened in 1956 to replace Charlestown State Prison, the oldest prison in the nation at that time.
Using chicken eyeglasses was still practiced in 1973, evidenced by Illinois' The Hawk-Eye newspaper that a farmer had 8,000 chickens fitted with the rose-colored variety. [20] One inventor of a form of the glasses proposed legislation in Kansas to require all chickens in the state to be fitted with glasses, but his campaign was unsuccessful. [21]