Tears keep your eyes healthy, clean and lubricated. People who do not produce enough tears suffer from a condition known as dry eye, in which not enough moisture is produced to keep the surface of the eyeball lubricated. This leads to pain, grittiness, vision blur and stinging. According to the authors of a new study published in JAMA Ophthalmology, people who spend more than seven hours per day in front of a computer screen may experience similar symptoms.
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