Ability to See. Darkness and other effects can interfere with vision by making a given area lightly or heavily obscured.​​

The presence or absence of light in an environment creates three categories of illumination:

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• Bright light lets most creatures see normally. 

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• Dim light, also called shadows, creates a lightly obscured area. ​​​

• Darkness creates a heavily obscured area. 

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See the sources of light table.

The distance between viewer and object, and size of  object, can sometimes affect vision.

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If you have darkvision or another special sense, your reliance on light is less or non-existent.