After you fire up the barbecue grill, the charcoal briquettes you use as fuel are eventually reduced to a pile of charred remains and ashes. This residue contains recycled plant material and naturally occurring minerals, but it may also contain harmful chemicals.
Burst blood vessel in the eye. Straining, coughing or injuring your eye can sometimes cause a blood vessel to burst on the eye surface, causing a bright red blotch. This is called a subconjunctival haemorrhage.
Rubbing the eye may also cause a blood vessel to break. The pressure does not have to be hard against the eye, and even a gentle rub may cause the vessel to break. Avoid rubbing the eyes and this may help prevent a broken blood vessel.