A mass airflow sensor. A mass (air) flow sensor (MAF) is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure.
Over time, scar tissue that forms from bleeding can cause the retina to detach from the wall of the eye (retinal detachment) and cause loss of vision. Severe proliferative retinopathy may be treated with laser surgery in order to save vision.
This dilation (and sometimes breakage) of blood vessels on the eye is what causes the redness. Eye injuries can range from minor eye scratches (corneal abrasions) to deep puncture wounds and chemical burns. Whatever the source, always treat an eye injury as a medical emergency and see an eye doctor immediately.