Night blindness is due to lack of:
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Answer:
Night blindness, or nyctalopia, is where the eye is unable to adapt to low-light conditions, such as at nighttime. Night blindness itself is not a condition but the result of an existing eye disorder.
When lighting is dim, the eye must adapt. Although night blindness adversely affects a person's ability to see in dim light, it does not cause complete blindness. It may create problems seeing road signs while driving at night. It may also take longer time than usual for the eye to adapt when going from light to dark settings.
Night blindness is a symptom of some underlying conditions, which may have several causes. This article will discuss symptoms, potential causes, and treatments of night blindness.
What are the symptoms?
Eye diseases can cause night blindness.
Night blindness is a symptom of an underlying eye condition that results in vision impairment while in dim lighting.
For example, night blindness could prevent someone from being able to see stars at night, or obstacles in a dark room.
To identify night blindness, the American Academy of Ophthalmology suggests that people consider the following questions:
Is moving around the house in dim light a challenge?
Is driving at night increasingly difficult?
Is it tricky to recognize faces in dim light?
Does it take an abnormally long time to adjust to a light room after being in the dark?
Does it take a long time to see in a darkened room after being in the light?
Other symptoms may also occur with night blindness. The nature of these symptoms will depend on the underlying cause but may include:
headaches
eye pain
nausea
vomiting
blurry, or cloudy vision
sensitivity to light
difficulty seeing into the distance
Answer:
lack of Vitamin A causes the night blindness