I've got an even better eye-test anecdote.
I went to a local optician for a routine test, he seemed perplexed as I read the chart, I thought I had done quite well, and then I realised what had happened.
In his small examination room, the laterally reversed chart was behind me and I was viewing it through a mirror in front of me.
Because I was aware of the mirror I automatically read the lines from right to left!
I asked him if many of his patients did that, but he said no, I was the first in his career, but he did go on to say that clearly this was evidence of a
superior intellect. 