As for lighting during the NAMI eye exam, the lights were dim, and they had the charts at the end of the room lit up. He used a projection device to display them on the wall. Of course, this was 4 years ago for me, things may change depending on which doctor does it. I usually test for 20/20 or 20/25, but when there, I scraped by with 20/30. I attribute a lot of it to stress, since it is something you have ABSOLUTELY no control over. Oh well, for me at least, that is in the distant past. I hope everything works out for you.
John