Bert told me not to worry about it, and went on to explain his little secret. Bert said that he just simply memorized the line for 20/20 vision, on the standardized eye chart that is used all over the world, which is "D E F P O T E C". He said he knows it by heart now, and when ever he has to go for his eye test he just recites it from memory.
http://abcd.kikooboo.com/fr/page/4-http-www-skipjack-nathan-org-saling-php-zxc
http://abcd.kikooboo.com/fr/page/4-http-www-skipjack-nathan-org-saling-php-xzc
http://abcd.kikooboo.com/fr/page/4-http-www-skipjack-nathan-org-saling-php-xzc-1