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Thus an eye care professional, having determined that a myopic (nearsighted) person requires a basic correction of, say, −2 dioptres to restore normal distance vision, might then make a further prescription of 'add 1' for reading, to make up for lack of accommodation (ability to alter focus). This is the same as saying that −1 dioptre ...
The English idiom "rose-colored glasses" or "rose-tinted glasses" refers to perceiving something more positively than it is in reality. The Romans occasionally referred to this phenomenon with the Latin phrase "memoria praeteritorum bonorum", which translates into English roughly as "memory of good past", or more idiomatically as "good old days".
Other additives used in crown glasses include zinc oxide, phosphorus pentoxide, barium oxide, fluorite and lanthanum oxide. The crown/flint distinction is so important to optical glass technology that many glass names, notably Schott glasses, incorporate it. A K in a Schott name indicates a crown glass (Krone in German).
Sir Isaac Newton FRS (25 December 1642 – 20 March 1726/27 [a]) was an English polymath active as a mathematician, physicist, astronomer, alchemist, theologian, and author who was described in his time as a natural philosopher. [7]
Qalaherriaq (c. 1834 – 1856) was an Inughuit hunter from Cape York in northwestern Greenland.Born around 1834 and baptized Erasmus Augustine Kallihirua, he was taken aboard the British barque HMS Assistance in 1850 as an interpreter during the search for Franklin's lost expedition.
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