I remember reading an article about a blind quilter. Googling, I came across a link to a newsletter where a blind quilter is supposed to have given some ideas:
[You’ll find these tips in the Oct. 31 issue of Kaye Wood’s Quilting Newsletter at
http://www.kayewood.com/newsletter.pdf ]
Don't feel like signing up myself, but you may want to.
I know the the Society for the Blind has many aids to assist a visually challended person INCLUDING sewing supplies. Do you have a chapter in your neighborhood?