Eyeglasses

Eyeglasses are a pass-through interface that allows people to focus through the lens instead of on the lens. This restorative technology can be both functional and decorative. 

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III.

Technology should function as a pass-through.

Technology should inform and support the user in their task, without drawing attention to the actions required to do the task.

A person's primary task should not be engaging with the technology, but being human.