How well you can see in a situation depends upon one or both of the following:

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(1) Your source of light. (86) 

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• Bright light lets most creatures see normally. 

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• Dim light creates a lightly obscured area. ​​​

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• Darkness creates a heavily obscured area. 

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If you have darkvision or another special sense, light is usually less important or not important at all.