With increasing age the lens of the eye becomes less transparent.
By age 60, the light passing through the lens has been reduced by
50%; by age 80, it can be reduced by as much as 75%. For many people,
the effect is like looking through a plastic bag. Below is a list
of possible symptoms:
Many report the feeling of a film over the eye.
Still others report glare from bright sunlight, irritation,
or poor vision when viewing oncoming automobile headlights
at night.
As cataracts develop in one eye, depth perception can be
affected.
As the lens hardens, it can sometimes bend light rays so
that close objects can be seen without glasses (so-called
“second sight”).