EVERY 20 MINUTES,LOOK AT SOMETHING 20 FEET AWAY FOR AT LEAST 20 MINUTES, GOOD FOR EYES REST TIME, KEEP SCREENS ABOUT 25 INCHES, GOOD FOR EYES USING DISTANCE, 1 HOUR OF SCREEN TIME, GOOD FOR EYES USING TIME, LOOKING CLOSE OVER 20 MINUTES, BAD FOR EYES REST TIME, LOOKING THINGS RIGHT IN FRONT OF YOUR EYES, BAD FOR EYES USING DISTANCE, 2 HOURS OF SCREEN TIME, BAD FOR EYES USING TIME

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