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.
Events that can cause blood vessels on the front of the eye to break include: 1  Sneezing. 2  Coughing. 3  Vomiting. 4  Straining. 5  Poorly controlled blood pressure. 6  Crying. 7  Rubbing your eyes. 8  Blunt trauma. 9  Increased intracranial or intraocular pressure.