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.
Your first thought might be that your eyeball is bleeding. What has actually happened is a subconjunctival hemorrhage, which is the breakage of tiny blood vessels just underneath the surface of your eye. As scary as it may look, broken blood vessels in your eye are usually harmless and disappear within a few weeks. Causes