Dark lens are used for moderate to bright sunlight conditions.
Clear lens are used for low intensity light and night time conditions.
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.
The high contrast visor (HCV) provides the wearer with a heightened and enhanced field of vision when flying in low-light conditions, such as foggy, overcast, hazy, or cloudy environments. This advanced polycarbonate HCV creates a viewing field where all blue components appear black or very dark and other color components are nearly their normal color.