Viziera Arai SAI visor Light Smoke

But the clever PSS system offers additional advantages, no internal visor can deliver. With the visor in the up position it functions as a peak. The locking mechanism will keep the peak in position. Glare from high sun is filtered out.

When the sun is low, only a subtle dip of the head is needed to reduce ambient light. The PSS will not block the complete field of view, just the part that causes glare. You still have the advantage of a clear view through the clear visor.

Compare it with sun visor in a car, only the PSS functions much faster. Just a dip of the head is all that is needed.
No need to take a hand off the handlebars to operate a lever or button. The riders view is not blocked by a full sun visor, the clear part offers a clear view on the road ahead. PSS takes away the glare, not the view on the road and other traffic.

An additional advantage the Arai PSS offers, that no ordinary internal drop down design can, is that in the up position it even works at night by effectively blocking the glare from overhead street lights.