Liquid specs: self-refractive glasses

 
They consist of clear membranes filled with silicon oil, protected by plastic discs. The wearer can adjust the amount of oil in the lenses using a dial fitted to a syringe on the arms of the glasses.

Changing the amount of oil in the lenses changes their curvature, which alters their strength. When someone has adjusted the lenses to suit their vision, the lenses are sealed with a valve and the syringes removed, giving near-instant glasses with no need for an optometrist.

 http://www.cnn.com/2009/HEALTH/09/16/liquid.glasses.self.refraction/index.html 
 
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 If you fill them with Bud Light, does that give you "Beer Goggles?"

  

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