Occlusion's a term indicating that the state of something, which's normally open,'s now totally closed. In cardiology, the term's often used to refer to blood vessels, arteries or veins which have become totally blocked to any blood flow. For issues of artery occlusion, see stenosis, atheroma, and coronary catheterization. In ophthalmology or orthoptics, occlusion refers to the patching of a person's good eye, in order for their weaker eye to receive more visual stimuli - as in amblyopia. I… (More on Occlusion)