Their surface is covered in blood vessels that expand when they’re irritated or infected. That gives your eyes the red look. Eyestrain can do it, and so can a late night, a lack of sleep, or allergies. If an injury is the cause, get it checked by your doctor. Red eyes could be a symptom of another eye condition, like conjunctivitis(pinkeye) or sun damage from not wearing shades over the years.
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