What are rods?
Rods are one of the two types of light sensitive cells in the retina, the other cells are called cones. The human eye contains about 125 million rods, which are necessary for seeing in dim light. Unlike cones, there aren't different classes of rods for different wavelengths of light, so in dim light when just rods are stimulated we see in black and white.
More help in store
If you need more help, you can contact us by searching for your nearest store below. Just type in your postcode, city or town.