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In glasses with powers beyond ±4.00D, the vertex distance can affect the effective power of the glasses. [4] A shorter vertex distance can expand the field of view, but if the vertex distance is too small, the eyelashes will come into contact with the back of the lens, smudging the lens and causing annoyance for the wearer.
This specifies the part of the prescription designed primarily to improve far vision. In a bifocal lens, this generally indicates what is to be placed in the top segment. NV is an abbreviation for near vision. This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens.
[100] [101] The American Optometric Association's Clinical Practice Guidelines found evidence of effectiveness of bifocal lenses and recommends it as the method for "myopia control". [71] In some studies, bifocal and progressive lenses have not shown differences in altering the progression of myopia compared to placebo. [95] [102]
Bulletproof glass of a jeweler's window after a burglary attempt. The Mona Lisa behind bulletproof glass at the Louvre Museum. Bulletproof glass, ballistic glass, transparent armor, or bullet-resistant glass is a strong and optically transparent material that is particularly resistant to penetration by projectiles, although, like any other material, it is not completely impenetrable.
Some representative refractive indices; Name of material λ (nm) Refractive index no. n Reference Vacuum: 1 (by definition) Air at STP: 1.000273 [citation needed]Gases at 0 °C and 1 atm
44 ml (1.5 US fl oz) or 43 ml (1.5 imp fl oz) 71 ml (2.5 imp fl oz) In Canada, a "shot" may refer to an official "standard drink" of 1.5 imperial fluid ounces or 42.6 millilitres, [11] though all establishments serve a "standard drink" of 1 oz. [12] However, shot glasses available in Canada typically are manufactured according to US fluid ...
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