The Market - Some Facts
  
There is a significant commercial demand and related opportunity for such a system:
There is an estimate that approximately 2.2 billion people in the world live with some form of
vision impairment. With regards to distance vision, 792 million people have mild vision
Impairment, 295 million have moderate to severe one, and 43.3 million are blind.
(https://www.who.int/news-room/fact-sheets/detail/blindness-and-visual-impairment)

More than 34 million Americans adults between the ages of 18 and 64 and 13 million American

adults 65 years and older are either legally blind or visually impaired.
(https://www.nih.gov/news-events/news-releases/visual-impairment-blindness-cases-us-expected-double-2050)
It has been estimated that there are 70,000 - 100,000 deaf-blind people in the US.
(https://nationaldb.org/library/page/1934)