Probably she wanted to test you eyes' focusing power. As far as I know they do it By using eye charts, lenses, and special instruments. In my own eye exam, she held a paper with a word written on it at about 5 inches from my eyes and she put a lense infront of my eyes to blur the vision then she asked me to tell her when it becomes visible then she would remove it, she repeated it until my eyes became tired and I couldnt see visibly anymore! Whe I asked her about it, she said its used to measure your eyes strenghth and fatigue! check this:
http://www.allaboutvision.com/eye-exam/expect.htm
WOW! b747heavy, all I can spot in that photo is a gorgeous girl! I wish all eye test were like that! Even a blind can see her!
