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Bifocals. A bifocal lens with areas of differing magnification. Bifocals with separate lenses. In this case, the Swedish ethnologist Jan-Öjvind Swahn [sv]. Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.
Zenni Optical mail order. Zenni Optical was founded in 2003 by Tibor Laczay and Julia Zhen. [1] [2] Before being renamed to Zenni Optical when it began offering $7 and $8 glasses, the company was named 19dollareyeglasses.com. [3] [4] [5] Around 2014, co-founder Zhen acquired the building occupied by the Marin Independent Journal to house Zenni. [6]
Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, [1] and they can be worn to correct vision or for cosmetic or therapeutic reasons. [2] In 2010, the worldwide market for contact lenses was estimated at $6.1 billion, while the US soft lens market was estimated at $2.1 billion. [3]
Perkins Observatory is an astronomical observatory in Delaware, Ohio. It is owned and operated by Ohio Wesleyan University. In 1931 it had the third largest telescope in the World; the 69 inch aperture Perkins telescope came online at this observatory. [1] The mirror was the largest cast in the United States up to that time, and it was made by ...
For reference: Apple's newest smartphone, the iPhone 15 Pro, has a camera lens with f/1.78 aperture, and would be best protected with a solar filter or eclipse glasses during a partial eclipse.
The new contract preserved the orchestra's 53 full-time positions but reduced salaries by about 27 percent. Further cuts in management expense reduced the annual budget by a total of $2.7 million for a new annual budget of $9.5 million. The concessions were, according to news reports, in the interest of preserving the orchestra. [11]
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