摘要
Close your left eye,Keep your right eye looking at the dog and move the bookback and forth[来回地]in front of you.At one point the cat disappears!You have justfound your blind spot.Everyone has one.It is the spot where the optic nerve[视神经]cord[索状组织,神经]leaves your eye,and there are no nerve cells to see the image.If youuse both eyes as you look as the dog,you won’t have a blind spot.The image fromyour left eye will make up for[弥补]the blank[空白] in your right eye.
