Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension.

Bend the temples up gently if they are rubbing the back of your ears and bend them down if your glasses are sliding down your nose. Straighten the entire temple and re-bend the curve to tighten the fit around your ear if your glasses are slipping down all

Corning's ultrathin bendable glass is still in development, but it can fold almost in half. Corning "To go to a tight bend radius, you have to go to a glass that's much, much thinner than what you ...