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Vacuum glazed sunglasses

  1. Nov 22, 2015 #1
    Is there such a thing? Wouldn't such a thing give ultimate protection for the eyes?
    I first thought i would post this in general engineering, b/c i have another question: How thick must the total eyepiece be if i need 2 semi-transparent sunglass material (of the size of a standard sunglass eyepeice) and a layer of vacuum between them?
     
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  3. Nov 22, 2015 #2

    mfb

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    Why do you expect a positive effect of a vacuum? Sunglasses are against electromagnetic radiation, if that radiation could not go through vacuum it wouldn't reach Earth anyway.
     
  4. Nov 24, 2015 #3
    The prime reason of the vaccum being there is to prevent heat transfer, so that the eyes can stay warm, in temperatures like -30 celsius with strong winds.
     
  5. Nov 24, 2015 #4

    russ_watters

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    Generally, for very cold weather, people wear goggles. Sunglasses don't seal around the eyes, so insulation wouldn't do anything for them.
     
  6. Nov 24, 2015 #5
    Point. So then goggles with EM radiation and vaccum protection?
     
  7. Nov 24, 2015 #6

    russ_watters

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    Astronaut helmets don't use multi-pane glass, so I don't see how extra insulation solves any real problems.
     
  8. Nov 25, 2015 #7

    mfb

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    Well, they have the vacuum for free.

    You could reduce thermal conductivity with a layer of vacuum, but compared to other points of heat transfer the glass doesn't sound like a major problem. A vacuum would also mean that the glasses have to be quite thick and heavy.
     
  9. Nov 25, 2015 #8
    Right. Well, i guess that closes this case.
     
  10. Nov 25, 2015 #9
    Thats what i'm wondering about, is this primarily because of low quality/normal glass?
     
  11. Nov 25, 2015 #10

    mfb

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    It is primarily because flat glass is not very good in handling 105 Pa pressure difference.
     
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