While it was the most deadly earthquake and the fifth deadliest natural disaster in history, there have been earthquakes with higher magnitudes. Aftershocks continued several times a month for half a year.
What eye prescription is considered legally blind? A: In order to be considered legally blind, a person must have a score of no better than 20/200 on a vision test while wearing corrective lenses, according to WebMD. The test may also be administered with a restricted field of vision, but the results must be the same. Continue Reading.
However, 90 percent of legally blind people can see something, even if just light. Those who can see only light are often light-sensitive and bright light can cause pain. If they can't see much beyond light, they will rarely have a warning when bright light is coming. So, dark glasses are a real necessity. And then there are the rest of us, i.e. most people who are legally blind who can actually see some but not much. We often wear glasses in order to improve our vision.