Gujarat BoardEnglish MediumSTD 8ScienceLight4 Marks
Question
What is night blindness? What causes night blindness?
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Answer
The following factors cause night blindness:
$1.$ The deficiency of Vitamin $A ($retinol$)$ in the diet of a person for a considerable time can lead to the disease called night blindness.
$2.$ The disorder in which the rod cells in the retina gradually lose their ability to respond to the light.
$3.$ It can also happen due to cataract, or clouding of the eye's lens.
$4.$ Usher syndrome can also cause night blindness, which is a genetic condition that affects both hearing and vision.
$5.$ Nearsightedness or blurred vision can also cause night blindness.
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