cause & effect
Today many student's eyesight is failing.
Because student love watching TV and playing internet game.
Long term of an exposure to tv or computer can lead to an optical defect.
Student also like pretty color lenses.
Long-term use of clolor lenses could cause corneal damage.
This is a good start, but needs a title specific to the topic. It also needs a concluding sentence. Also, you should format it as a paragraph, not a list of sentences.
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