[pk-protect-ai]

Glass protects from UV bellow 350nm, which leaves 350nm-400nm band open. So additional coating is required. I might be wrong but such factors as glass thickness and the radiation intensity should be also accounted for. Every physical object is mostly an empty space ...

[terminalshort]

Visual range goes to 380. I'm skeptical that light at 350 is really doing much damage to my eyes.

[pk-protect-ai]

It actually does not not matter what you see. You can't see UV, and it harms your eyes. What you need is a protection from UV band, and that is exactly what your eye can't see.