Reading over Silvan's profile and the "All-Seeing Eye" thing that Odin had going on.

Those glasses are far from useless. Even though it's within Hikaru's field of vision, seeing [i]anything[/i] is pretty scary.

>Seeing structural weaknesses in a weapon
>Seeing the way the movement of the air
>Seeing mana buildup

Being able to see anything is incredibly versatile.