Inaviation training, aview-limiting device simulatesinstrument meteorological conditions (IMC) by restricting a pilot'sfield of view only to theflight instruments. They are worn by pilots who are working toward aninstrument rating, which allows a pilot to fly underinstrument flight rules in conditions that do not permitvisual flight. They are also used by instrument-rated pilots while practicing instrument flight to maintain competency.[1][2]
Examples include foggles and the IFR hood. Foggles are glasses that have been frosted on the top half of the lenses to simulatefoggy conditions.
In 2021 The Instrument Conditions Awareness Recognition and Understanding System (ICARUS) Smart View Limiting Device was developed. ICARUS uses Polymer Dispersed Liquid Crystal Film orSmart Glass to electronically change between simulatedVMC andIMC to aid pilot training. This capability allows pilots to actually train forVFR into IMC which often leads tospatial disorientation.
