VISION

Make a Vision roll whenever it is important that you see something.

Modifiers: 

When you try to spot something that is deliberately hidden, the GM may treat this roll as a Quick Contest against a concealment skill (Camouflage, Holdout, etc.), and may allow – or require – a skill such as Observation or Search to replace Perception for the roll.

Note that the curvature of a planet blocks vision beyond the horizon.  The normal horizon on an Earth-sized planet is about three miles for an observer five to six feet in height.  The GM should increase this for taller observers or those in elevated positions. There is no horizon in space!

Useful Advantages:
Night Vision cancels -1 in partial darkness penalties per level, and Dark Vision lets you ignore darkness penalties.

Peripheral Vision gives you a Vision roll to see anything that is not absolutely, positively, directly behind you – and 360° Vision lets you see even that! Telescopic Vision cancels -1 in range penalties per level.

Limiting Disadvantages: