The incident began about noon when a visitor to the memorial discovered the note in a plastic document holder. After evacuating the area, U.S. Park Police found a travelers' coffee mug near the note on the steps and a Gatorade bottle in a women's restroom. None of the objects was found to be a threat.
But there is also the nose pads which rest on your nose...these are connected to the pad plate and the pad arm which are connected to the bridge... http://visual.merriam-webster.com/clothi... It is the side pads that rest on your nose and are designed to take the weight of your glasses. If they are not sitting properly go back and get them adjusted. The bridge above holds the lenses together; the nose pads below, on your nose. They are called nose pieces.
Bifocals are glasses that have both a correction for your distance vision on the top of the lens, and a correction to help you read on the bottom. The first bifocal was actually invented by Benjamin Franklin.