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It was then fitted with a 25mm glass lens in order to give it a richer, deeper look more akin to a real Magic Eye tube ... is that the build is a direct replacement for a real 6U5 tube.

Prescription eyeglasses can cost as much as $1,000, and most have plastic lenses, which scratch more easily than glass. Clearly, you need to protect your investment. But should you clean lenses ...