Eye discharge is a combination of mucus, oil, skin cells and other debris that accumulates in the corner of your eye while you sleep.
Your eyes produce mucus throughout the day, but a continuous thin film of tears bathes your eyes when you blink, flushing out the rheum before it hardens in your eyes.
When you’re asleep — and not blinking — eye discharge collects and crusts in the corners of your eyes and sometimes along the lash line, hence the term “sleep” in your eyes.
Taken from allaboutvision . Com
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