People with glaucoma can lose nerve tissue, resulting in vision loss. The optic nerve is a bundle of about 1 million individual nerve fibers that transmits the visual signals from the eye to the brain. In the most common form of glaucoma, primary open-angle glaucoma, the fluid pressure inside the eye increases. This increase in pressure may cause progressive damage to the optic nerve and loss of nerve fibers. Vision loss may result. Advanced glaucoma may even cause blindness.
The Yellowstone caldera is located over a âhotspotâ, where volcanism â and in the case of Yellowstone, hydrothermal activity â is occurring far away from the plate boundaries where such things are normally found.he Yellowstone caldera is located over a âhotspotâ, where volcanism â and in the case of Yellowstone, hydrothermal activity â is occurring far away from the plate boundaries where such things are normally found.
Super volcano. Today's caldera of Yellowstone National Park was created in the last major eruption of the volcano about 640,000 years ago. Under the caldera is a huge magma chamber located approximately eight kilometres deep, which is now almost filled with lava.aldera, which lies at the heart of Yellowstone National Park, is the tip of a huge volcano, which is in turn, bound to a hot spot. This is a fixed point within the earth's crust, where hot magma rises to the top.