A cataract is a painless, cloudy area in the lens of the eye that blocks the passage of light to the retina, the nerve layer at the back of the eye, usually causing vision problems.
白内障是指眼内晶状体的无痛性浑浊阻碍了光线到达视网膜(眼球后部的神经层)，从而引起视力问题。
2
It blocks the connection of adenosine to nerve cells.
它阻碍腺苷与神经细胞之间的联系。
3
The Reclaim system uses a small electrical generator known as a pulse generator to create electrical stimulation that blocks abnormal nerve signals in the brain.