Originally Posted by
Kerberos
Of other note... I think that this is a bit subjective as well.
Who's got the same level of clarity or night vision as anyone else?
Eyes' abilities are almost unique as the individual who owns them.
That is a good point.
The receptors that are most useful at night (the rods) are most densely located outside the point of central vision (macula lutea) at the back of the eye. As a result at night our vision is less acute because the receptors that best help us see at night are off the point of central focus.
The rods are extremely sensitive to light (as opposed to the cones) and as a result of this we best pick up movement (changes in light, right?) out of our peripheral vision. This is also why it is so important to keep our eyes moving and use off center viewing techniques at night.
(This info came from our night shoot handout - I'm not an optometrist)
IIRC, if there is just enough light to see objects, our night acuity is in the area of 20/400. Most drivers handbooks will tell you visual acuity is reduced 25% at night.
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