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Scientists say they can help the
of older people. They say that looking at a
light for three minutes a day for two
could make them see
. A researcher looked at how red
could help older people see better. He said: "I
suggest that people do not just go and buy a red light off the
. They have to produce the right
and be reliable. We are looking for a...
to do this and to price
at...around $20."
