6/6 vision test

[long final]

Has anyone had any trouble passing the 6/6 binocular test? I will be having my medical soon, and can read the necessary line, but sometimes its close! I wondered what the examiners are like if you got one messed up, eg c & o etc., is it a certain fail criteria?

Regards. .LF. . <img src="rolleyes.gif" border="0">