Night blindness is warning signal.
Some people have extraordinary difficulty adjusting to low light levels, and, in some cases, can not do so at all. Amalia Miranda, an ophthalmologist at the University of Oklahoma Health Sciences Center, notes that limited vision at night not only may be distressing, it can be dangerous. "night blindness ... can be the first symptom of retinitis pigmentosa, a disease which results in blindness or severely limited vision. People suffering from night blindness should never drive a vehicle after dark."
In a very few cases, night blindness is idiopathic, meaning it is a disease that develops without an apparent known cause. In others, it may have a recognizable pattern of signs and symptoms and might be treatable. "Night blindness is also one of the symptoms of vitamin A deficiency, although this is rare. A person has to be in very bad shape nutritionally for this to occur, and he or she would have other obvious symptoms, such as dry eyes, dry skin, loss of hair, etc. The...
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