Retinal artery occlusion occurs when the retinal artery (or one of its branches) becomes blocked. This results in the blood and nutrient supply to the nerve layer of the retina being cut off. This leads to permanent damage and is a common cause of sudden loss of vision in one eye.
Quench is defined as to satisfy or to extinguish. An example of to quench is to have a cold drink when thirsty. An example of to quench is to put out a fire.
Answer Wiki. Further to other answers, quenching is also used to describe a type of unfortunate occurrence with a Superconducting magnet. The coils in such a magnet are made from an alloy such as Niobium-titanium, which need to be cooled with liquid nitrogen (or, in the bad old days, liquid helium) to superconduct.