I , too, am legally blind, and struggle with lining up seams, and such.. I decided when I began to quilt a few years ago, that just because my eyesight might be extremely poor, that I could see beauty in what I create, because everything in my old line of sight ( before becoming legally blind ) was beautiful.. I might not see other things clearly, or have perfect or even semi perfect looks to my quilts, but I do see perfection in the joy I have creating them.. Usually, and I say Usually, noone makes rude comments about why a seam isn't lining up , or why color matches don't always go.. just because they don't like it, doesnt mean I don't love making them..
So just hang in there, and be VERY proud of your accomplishments, because I know how hard it is sometimes when our vision doesn't line up with our abilities to create..