'This vitamin is necessary for the production of visual purple; a deficiency of it leads to night blindness'
vitamin A
YOUR EYE: This vitamin is necessary for the production of visual purple; a deficiency of it leads to night blindness
This vitamin is necessary for the production of visual purple; a deficiency of it leads to night blindness
This vitamin is necessary for the production of visual purple; a deficiency of it leads to night blindness
YOUR EYE
vitamin A
YOUR EYE