VISOR

A VISOR (Visual Instrument and Sensory Organ Replacement) was a device used by blind individuals to give them a form of sight. The VISOR sensed signals across the entire electromagnetic spectrum, and transmitted them to the sensory centers of user's brain via delta-compressed wavelengths.

Geordi La Forge, who was blind at birth, received his first VISOR sometime after his fifth birthday, and used it until circa 2372. (TNG episode: "Hero Worship"; movie: Star Trek: First Contact)