viduity

例句：

1. 1.The scientist's research has greatly improved our understanding of the human eye.
   科学家的研究极大地提高了我们对人眼的理解。
2. 2. She was able to see clearly in low light conditions.
   她在低光条件下能够看得很清楚。
3. 3. With age, people often experience a decline in their visual abilities.
   随着年龄的增长，人们的视觉能力往往会下降。