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.
For example, the shortsighted glasses prescription could be -10, -15 or -20, and as long as a person can see better than 6/60 or 20/200 (with a visual field of >20 degrees) while wearing those glasses then they are not blind. It is not the prescription that determines legal blindness. Legal blindness is visual acuity (usually determined using a standard eye chart) which is 20/200 or less in the better eye with the best possible correction (or a restricted visual field of 20 degrees or less). That best possible correction (i.e. the eyeglasses/contact prescription you mentioned) would vary depending on the person.