It's natura circle of life. Not only eyes will get worse day by day, but also all organs will stop working gradually with your ages increasing. When we grow old, the cells can not afford our needs and the ametabolism has slow down. Eye sight cannot escape such fate as well. Visual perception is the ability to interpret the surrounding environment by processing information that is contained in visible light, which known as eyesight, vision and sight. The reason why we can assimilate information from environment just because we have a visual system, and the most important part of it is retinal, which is in the black of eyes. But with time flies, retinal also grows older, the sensitive ability begins to fall down, even not work any more. All light -sensitive must through retina, then images can occur in our eyes. When we grow old, retina also grows old and it cannot still have enough power and energy to service us. That's why that our sight becomes worse day by day.