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.
Eye Problems and Blood in the Eye. Sometimes small blood vessels in the whites of the eyes break and cause a red spot or speck. This is called a subconjunctival hemorrhage. The blood vessels may break because of sneezing, coughing, vomiting, straining, or bending over, but sometimes there is no clear cause. The blood may look alarming, especially if the spot is large. It is usually not a cause for concern and will clear up in 2 to 3 weeks.
Bleeding of the eye is usually caused by suffering an injury to the eye. 1  Less common but serious causes of eye bleeds include cancer, malformations of blood vessels in the eye, and irritation and inflammation of the iris (the colored part of the eye.) Small subconjunctival hemorrhages can result from forcefully sneezing or coughing.