I have astigmatism and long sightedness. I was diagnosed in grade 3 but didn't get my glasses until year 12 when my dad was threatened with Dhs. My parents had religious beliefs that they felt would cure my eye sight. Anyway. I learnt to read, recognise the world etc without them and could function quite well. It was only when I got my glasses that I realised that the world looked different. It was amazing. So I can see how kids seem fine and can read and recognise stuff because if you teach them that a shape etc is a certain thing and their eyes don't focus then they earn that the blurred shape is the letter/ thing etc.