Polycarbonate lens for HGU-33 single visor system.

The visor colors available are dark, clear, amber, and gradient. 

Dark Lens are used for moderate to bright sunlight conditions.

Clear Lens are used for low intensity light and night time conditions.

Amber lens are used for light haze, smog, and reflected light off snow.

Gradient lens help the wearer see instruments clearer when outside conditions are moderate to bright sunlight and low light to dark conditions in the cockpit. An example of this set of conditions would be flying into the sun at sunrise or sunset. The top of the lens is similar to a dark lens and the tinting transitions from dark to light towards the bottom of the lens.