Many factors affect eyesight, and scientists
don't know for sure exactly how they all work.
Here are some current theories about things that
affect your eyesight.
Scientists think that repeated eyestrain can
damage your vision. So if you can't quite read
something, it's better to move closer before you
try again, instead of squinting and trying harder.
Also make sure to work under normal light, instead
of straining your eyes in the dark or in very
Scientists think that normal exposure to
daylight can protect your vision. This
includes being exposed to sunlight during the day,
and being in the dark at night. So it's better to
use your eyes during the daytime and sleep at
night, instead of using electrical lights when
it's dark outside.
Finally, part of your eyesight just comes from
your parents. A lot of people can't help becoming
nearsighted as they grow up. Luckily, technology
can still help nearsighted people see clearly.
Common uses of technology are glasses, contact
lenses and vision correction surgery (or laser eye
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