Foggles

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Foggles are glasses that have been made to simulate foggy conditions to the wearer and are used in pilot training exercises. They are a type of view-limiting device. Foggles are frosted on the top half to limit the field of vision of pilots and force them to use only the flight instruments,^[1][2] simulating the conditions of low ceiling of clouds, heavy fog, night, and other instrument meteorological conditions (IMC).^[3] Under these conditions, pilots must fly under instrument flight rules (IFR), rather than by outside visual references under visual flight rules (VFR).

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