Augmented reality contact lens.
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Previously:
https://www.homemadetools.net/forum/...223#post116009
https://www.homemadetools.net/forum/...328#post142264
https://www.homemadetools.net/forum/...124#post168713
https://www.homemadetools.net/forum/...965#post187271
https://www.homemadetools.net/forum/...687#post139836