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The bright light overwhelms the retinas of the eyes and generally gradually fades, lasting anywhere from a few seconds to a few minutes. However, if the eyes are exposed to a high enough level of light, such as a nuclear explosion, the blindness can become permanent. Flash blindness may also occur in everyday life.
In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousands of instrumentally detectable aftershocks, which steadily decrease in magnitude and frequency according ...
Photokeratitis or ultraviolet keratitis is a painful eye condition caused by exposure of insufficiently protected eyes to the ultraviolet (UV) rays from either natural (e.g. intense direct or reflected sunlight) or artificial (e.g. the electric arc during welding) sources.
A 4.0 magnitude aftershock hit 37 miles west New York City in New Jersey around 6 p.m. Friday. According to the United States Geological Survey it was felt as far away as Long Island, where there ...
The 2024 solar eclipse on April 8 can be harmful for your eyes. Doctor explains how vision could be damaged by looking at the sun, which eclipse glasses to buy.
From forgetting to cleanse before bed and not sleeping enough, to smoking and not eating the right diet, these bad habits could damage the often neglected part of your body. Eye health: Sleeping ...
Peripheral (posterior) vitreous detachment occurs when the gel around the eye separates from the retina. This can naturally occur with age. However, if it occurs too rapidly, it can cause photopsia which manifests in flashes and floaters in the vision. Typically, the flashes and floaters go away in a few months.
Lying on the ground is also dangerous. [2] When a lightning strike seems imminent, a 'lightning position' can be taken by "sitting or crouching with knees and feet close together to create only one point of contact with the ground" (with the feet off the ground if sitting; if standing is necessary, the feet have to be touching). [ 5 ]