Hearing impaired people may not necessarily face more severe problems than visually impaired individuals, but their situation is as bad as any. Imagine living in a world where you aren't able to hear your mother's voice waking you up in the morning or the
Bionic Contact Lenses. The technology was trialled at the University of Washington in Seattle, and currently they’re safe and feasible, but lacking a good power source and only have a single-pixel display. But give it a few years.