Boy, is JudyMC ever right! I made a pieced quilt 3 years ago and had an absolute nightmare trying to get the corners to meet correctly. I had to buy more material, finally! AARRGHH -- anyway, I found that I was using two different brands of cutting rulers and they were just the most wee bit off each other. I thought I was losing my touch
. I had over 1/3 of the pieces cut by that time. I had to go back and decide which ruler to use (the one I could see best) and then re-cut all those I had cut with the other brand. I almost hated that quilt by the time I was finished! And, if, like me, you are 'getting on in years' (although not THAT much), you need to be extra careful because you need a LOT more light to see well. Growing old isn't for the faint of heart -- you have to be TUFF!
Hope you take the advice here and go to the store to audition several different brands, colors, etc. Everyone has their own colors they see well and colors that they have a hard time seeing, so it's very individual. Hope you find the perfect one for you!