Tag Archives: Night Blindness – Nyctalopia

What Is Night Blindness? Night blindness is a visual defect caused by lack of rhodopsin in the rods of the retina located in the back of the eyeball due to inadequate vitamin A. Q: How does inadequate vitamin A cause ...

Decreased ability to see in dim light is a visual defect caused by lack of rhodopsin in the rods of the retina at the back of the eyeball.  Another cause is hypoxia, or decreased content of oxygen in the blood. ...