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Flash blindness is an either temporary or permanent visual impairment during and following exposure of a varying length of time to a light flash of extremely high intensity, such as a nuclear explosion, flash photograph, lightning strike, or extremely bright light, i.e. a searchlight, laser pointer, landing lights or ultraviolet light. [1]
Common causes include welding with failure to use adequate eye protection such as an appropriate welding helmet or welding goggles. This is termed arc eye , while photokeratitis caused by exposure to sunlight reflected from ice and snow, particularly at elevation, is commonly called snow blindness . [ 5 ]
Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]
Solar retinopathy or "eclipse blindness" is untreatable and can catch you by surprise. Here's what to look for.
Although visual pollution can be caused by natural sources (e.g. wildfires), the predominant cause comes from human sources. [2] As such, visual pollution is not considered a primary source of pollution but a secondary symptom of intersecting pollution sources.
As Winokur explained, “The air handling is so large and so big,” in places like the Linda Ronstadt Music Hall, which has a capacity of more than 2000 people.
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Night blindness may exist from birth, or be caused by injury or malnutrition (for example, vitamin A deficiency). It can be described as insufficient adaptation to darkness. The most common cause of nyctalopia is retinitis pigmentosa, a disorder in which the rod cells in the retina gradually lose their ability to respond to the light. Patients ...