We can obtain Vitamin A from many kinds of food, such as liver, green vegetables. It helps form purple visual pigment of the rod cells of our retina and prevent us from suffering from night blindness. If we lack vitamin A, does it lead to blindness?

http://www.who.int/nut/vad.htm

http://en.wikipedia.org/wiki/Vitamin_a

It will not lead to complete blindness but could lead to inability to see in dim light.,

Green, what you're saying flies in the face of what is normally written about vitamins. Is there any reason for that?

Lack of vitamin A causes vision problems; dry, scaling skin

 

Extreme deficiency causes headache, irritability, vomiting, hair loss, blurred vision, liver and bone damage

 

not fun

Maybe vitamin A doesn't cause total blindness simply because the other effects of vit A deficiency will kill you first?

 

Mokele