A Google employee posted images of Google Glass with prescription lenses; rumors abound.

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​Google recently invited early adopters of its Google Glass device to trade in their existing unit for a free upgrade. And if rumors prove to be true, this updated version could support prescription lenses.

As of now, users with prescription glasses have two options: position the device over their eyeglasses, or take off their eyeglasses and try not to run into anything.

This has been one of the biggest complaints surrounding Google Glass, with good reason: Nearly three-fourths of the U.S. population wear corrective lenses.

Now, Google appears to be coming to its senses. These images, posted by an employee on Google's campus, show a new version of Google Glass with a handy slot for prescription lenses.

​It didn't take long for the images to disappear from the employee's Google Plus page, but as 9to5Google notes:

"You'd have thought Google of all companies would know you can't erase things from the Internet."

And now the unerasable images, plastered across the blogosphere, are open for scrutiny. SlashGear has a bone to pick with the lens-supported update because it seems the glasses might be attached to the device with a screw.

​"If the headset is permanently attached to the frames, that will mean the user will probably have to carry a spare set of glasses with them should they be required to remove Glass – such as when driving … or if they need to recharge it."

Google Glass blog Glass Almanac seems to confirm SlashGear’s suspicions. An early image of Google Glass shows frames that look quite similar to this alleged update. Thus, the evidence suggests users will have to order prescription lenses specifically for the Glass device.

Unless you're planning on wearing Glass as often as you wear your current glasses, you'll have to carry around a back-up pair of regular old glasses.

Especially if you plan to visit any number of places like movie theaters, casinos and certain bars that have already placed a ban on the high-tech spectacles.