Yep. I know first hand how accessibility hits you badly when you don't fit the average any more - so I'm right behind you there.

There's lots of chances for companies to fill a niche.

However, I know that over the years many accessibility improvements for people with disabilities have had actually improved others.

Take crescents on sidewalks for example - usually put in for wheelchair users; however they've had the unintended effect of helping with parents with children, older people etc.

Technology uses multiple ways to feedback signals to users - it's possible that helping partially sighted people in one way might make the experience for others more enjoyable and rewarding.