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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.
Closed-eye hallucinations and closed-eye visualizations (CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes, perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause stimulates the eye.
The effects of extended contact lens wear on the cornea have been studied extensively and are well-documented. When determining the effects of long-term contact lens use on the cornea, many studies do not differentiate between users of hard and soft contact lenses, while studies that have made this differentiation have found similar results.
A flash illuminating a person's breath in cold weather, cigarette smoke or fog can look like "ectoplasmic mist". Long exposures, usually several seconds, can cause ethereal, see-through shapes or streaks of lines caused when the camera moves or if the object moves during the exposure.
A person with photic retinopathy may notice an impairment in their vision, for example a spot that does not go away after a reasonable recovery time, or blurring. They may also have eye pain or headaches. Vision impairment is usually in both eyes, but can be in just one. Impairment of a person with 20/20 vision usually ends up being about 20/40 ...
Wen: Common symptoms include runny or stuffy nose, sniffling, sneezing, coughing, watery eyes, scratchy throat, and itching and burning in the nose, mouth and eyes. Ragweed is a common culprit ...
While it was once “just” a medication for people with type 2 diabetes, metformin is now thought of as a “wonder drug with multiple potentials,” says David Cutler, M.D., a family medicine ...
A petechia (/ p ɪ ˈ t iː k i ə /; [1] pl.: petechiae) is a small red or purple spot (≤4 mm in diameter) that can appear on the skin, conjunctiva, retina, and mucous membranes which is caused by haemorrhage of capillaries.