Of the factual error variety?
When Mathias calms Neville can see in the light and they can see in the dark. Mathias and the family have very small pupils. Most creatures that see well at night have very large pupils to allow in more light.
I think it was because the actors were wearing colored contact lenses.
Next time you see me, it won't be me
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Remember that the family are mutants, so the rule of big or small pupils not apply, they mutate to that particular state and they just have their eyes that way and with that handicap.
Now also Omega Man is based in I Am Legend, so they really are vampire like creatures, and they crawl at nigth looking for victims. Maybe in the 60s was cheesy using garlic and mirrors to stop the infected, as Look at Him, He lives in the ligth when We rot in the nigth..i think that was the line.
Planet of the Apes alternate ending...So they have one of this too in this planet?
Because their eyes are very sensitive to light, their pupils contract to points ("miosis") even in very low-light situations, such as when they take off their glasses.
The don't necessarily have larger than normal pupils in dark environments (we never see that), they are just very, very sensitive to light. That's called photophobia and it is a common neurological symptom.
Their night vision may be no better than Neville's, but they can't stand the light.
They assume that Neville can't see in the dark because he only comes out in the day, but that's because he has an advantage during the day.
The Family may also just be better "dark adapted" than Neville. It takes about 30 minutes to become fully "dark adapted" - so, during that time, Neville would be more vulnerable.
I would think it's more of a goof that artificial light (or even the Sun light) bothered the, but the light from the bonfires didn't?
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Every person that served can be called a veteran, but not every veteran can be called a Marine.