Q. 74 B

What is night blindness? What causes night blindness?

Answer :

Night blindness is the inability to see properly at night or in poor light. In scientific terms, it is called as "nyctalopia".

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.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Lets Learn the Reflection of LightLets Learn the Reflection of LightLets Learn the Reflection of Light43 mins
NCERT | Reflection of LightNCERT | Reflection of LightNCERT | Reflection of Light40 mins
Quiz | Lets Have a Faceoff with Light!!Quiz | Lets Have a Faceoff with Light!!Quiz | Lets Have a Faceoff with Light!!37 mins
Quiz | Imp. Qs. on LightQuiz | Imp. Qs. on LightQuiz | Imp. Qs. on Light36 mins
Rapid fire quiz on LightRapid fire quiz on LightRapid fire quiz on Light39 mins
Quiz | Lets Revise LightQuiz | Lets Revise LightQuiz | Lets Revise Light29 mins
Lakhmir Singh | LightLakhmir Singh | LightLakhmir Singh | Light45 mins
Foundation | Multiple Reflections of LightFoundation | Multiple Reflections of LightFoundation | Multiple Reflections of Light38 mins
Know More About Human EyeKnow More About Human EyeKnow More About Human Eye43 mins
Lets See the Reflection of LightLets See the Reflection of LightLets See the Reflection of Light44 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses