随着年龄增长，他右眼的视力正在恶化。

His ___vision in his right eye is deteriorating with age.

盯着屏幕数小时后，她的视线开始变得模糊。

After hours of staring at the screen, her ___vision started to blur.

定期进行眼部检查对于保持良好的视力至关重要。

Regular eye exams are crucial for maintaining good ___vision.