Globally the number of people of all ages visually impaired is estimated to be 285 million, of whom 39 million are blind.
— World Health Organisation, 2010.
(That's 4.2% and 0.6% of the world population.)
Most videogames put a strong emphasis on visuals in their content delivery. Visually impaired gamers are largely left out.
How do I design a game to be accessible to visually impaired gamers?
Answer
Take a look at Game Accessibility Guidelines, lots of advice on there. Did you have something specific in mind that you wanted to design?
Caius is right in saying that there are mechanics that can't easily be adapted for blind gamers. Most can easily be improved for people with other varying degrees of visual impairment though - avoiding tiny low contrast text for example.
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