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Its all in the rods and cones. We have two types of photoreceptive cells in our eyes, rods and cones. The rods are more sensitive but only see in B&W and the cones see in colour but need more light to work properly. Also, they are not distributed evenly in the eye, the cones are more central and the rods further out. If you have plenty of light, like the moon then you can look straight at the object and see detail and colour but if the light levels are marginal the cones are not stimulated and don't work. Then, by looking slightly off centre you focus the light on the more sensitve rods but you only see in monochrome.
Make sense??
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