What you gotta do is, when they leave you in the room and the eye doctor hasn't come yet, you take a quick peek at the chart behind you (in front of you is a mirror reflecting the chart) and memorize the lowest lines.
Said Eye Doctor comes in and asks you to read the lowest line possible so you promptly spit out the bottom line "E R A F O T S I." Then the doctor asks you to read the 2nd line from top and you slowly stumble your way through "G...or is that a C, O, P...ermm..wait that last one might just be a Q..."