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.
Damaged blood vessels due to diabetic retinopathy can cause vision loss and blindness two ways: 1  Fluid leaks into the center of the retina, called the macula. This area of the retina is where central vision takes place. 2  In proliferative retinopathy, new and abnormal blood vessels grow.