Now, the use of lenses is very diverse and its technology keep evolving, specially the use of lenses for people who have abnormalities in their eyesight. In the past, people who have less sight used eye glasses to help his eyesight, and then eye glasses was replaced by something more simple, that is called contact lenses or Kontaklinsen.
Now, thanks to rapid technological developments, there is a special lens that can help a blind person to see again. And many more examples of the existing lens technology. But the increase of lens technology can not guarantee 100 percents safe automatically, there are still effects resulting from these technologies.
