How is visibility defined for IFR and VFR operations?

Visibility is defined for IFR (Instrument Flight Rules) and VFR (Visual Flight Rules) operations as the distance within which objects can be seen. This definition is crucial because it determines whether a pilot can operate under VFR conditions, which rely heavily on visual references, or under IFR, where pilots must rely more on instruments and navigation aids due to insufficient visibility.

In VFR operations, visibility is a fundamental requirement that helps pilots avoid obstacles and other aircraft, ensuring safety during flight. For IFR operations, visibility requirements are defined to ensure that pilots can maintain situational awareness when flying in cloud or low visibility conditions.

Defining visibility as the distance within which objects can be seen allows for a clear and standardized measurement that pilots can use to assess whether they can safely conduct their operations according to specific flight rules. This is why this definition is the most appropriate and relevant in the context of flight operations.