Yang Ting, 24, has been wearing non-prescription lenses 12 hours a day for the past six months.

杨婷，24岁，在过去的六个月里每天佩戴非处方美瞳约12个小时。

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Generally I pay for the highest level of non-glare coatings and I usually pick the middle of the thin-lens options (my personal prescription rules out the thinnest, lightest lenses).

我一般选择最高级的防辐射镀膜镜片，并且挑选中薄的(我的个人验光处方上规定最薄最轻的镜片)。

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Customers can buy pre-determined prescription strength lenses, or simply buy lenses with no prescription, without the need for an eye exam, which adds to the potential danger.

顾客不需要做任何眼部检查就可以买有视力矫正的美瞳，也可以买没有度数的美瞳，这也增加了潜在的风险。

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But, you ask, won't that be difficult when Glass is outfitted with prescription lenses one day?

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You can swap out the removable sunglass lenses for clear versions, or throw in your prescription in daylight (tinted) or indoor flavors, since many optical stores stock appropriately sized lenses.

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Del Vecchio isn't banking just on prescription glasses, not with so many people opting for contact lenses or corrective surgery.

FORBES: Lens master