The cause of red eyes may be insufficient sleep, prolonged work, or exposure to wind or sun. If the eyes redden without special reason, it may signify such diseases as increased intraocular pressure (glaucoma), high intracranial pressure, and diabetes.
Dry eyes cause discomfort and itching, and eye rubbing damages the delicate skin around them. This leads to the sagging of the eyelid and wrinkles and also increases the effect of air, making eyes even drier. The most common cause of eye itching is a seasonal allergy.
If excessive dryness is accompanied by increased sensitivity to light, this may indicate Sjogren’s syndrome, a rare immune system disorder.
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