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.
However, if the red area bulges or causes pain and changes to vision, you should contact an eye doctor. A broken blood vessel may happen spontaneously, without a known cause, but understanding some of the known reasons for the condition may help prevent broken blood vessels in the eye.