Yes, I have noticed it before, when not wearing glasses, and thought it was due to astigmatism. The thing I didn't understand was that, although wearing glasses cures this so that I didn't see the lines when looking at the chart with both eyes, when I covered my R eye (still wearing my glasses) the whole thing became very blurred and it took a while to make it out at all, then there where double lines.
Does this mean (a) my varifocal glasses are not correcting it, and (b) my brain is ignoring what my L eye sees, usually?