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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