What I found effective was focusing on each circle one by one on the row I was being tested on, remember to take your time. Then I would zoom out and look at the entire row. If you have depth perception the circle should pop out. Some people had depth perception problems, as in couldn't even pass the first set. They were issued glasses and were then able to pass all of the tests. See if your optometrist can prescribe you some glasses, those might help.