translation.en: Once we've discovered somebody has low vision, the next big challenge is to work out why, and to be able to do that, we need to have access to the inside of the eye.
translation.zh: 当我们发现某人有低视力的问题， 下一个大的挑战就是找出病因， 为了能找到病因点， 我们需要检查眼睛内部。