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Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown glasses such as the best optical quality low dispersion glass currently in production, N-FK58 made by the German company Schott ...
Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.
[2] [4] Rates vary significantly in different areas of the world. [2] Rates among adults are between 15% and 49%. [3] [19] Among children, it affects 1% of rural Nepalese, 4% of South Africans, 12% of people in the US, and 37% in some large Chinese cities. [2] [3] In China the proportion of girls is slightly higher than boys.
The pupil of the human eye can range in size from 2 mm to over 8 mm to adapt to the environment The human eye can detect a luminance from 10 −6 cd/m 2 , or one millionth (0.000001) of a candela per square meter to 10 8 cd/m 2 or one hundred million (100,000,000) candelas per square meter.
Tom and Jerry is an American animated media franchise and series of comedy short films created in 1940 by William Hanna and Joseph Barbera.Best known for its 161 theatrical short films by Metro-Goldwyn-Mayer, the series centers on the enmity between the titular characters of a cat named Tom and a mouse named Jerry.
[2] [3] In early 2016 about 30% of the population were non-citizens, a figure including refugees, legal and illegal immigrants. [4] Jordan's annual population growth rate stands at 3.05% as of 2023, with an average birth rate of 2.8. There were 1,977,534 households in Jordan in 2015, with an average of 4.8 persons per household. [4]
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