I think that's a gag in one piece. Even with the real one cracked, the next time we see him it's in perfect shape again.

Also, isn't the clone fabricated by Doflamingo himself with his ability?

@SkywalkerTC this is the seraphim Doffy

Honestly at this point I think they’re just part of his body.

Like after Luffy broke them, when they show up again it’s just because he healed from the fight

Or Oda is just too lazy to draw another pair of eyes

Probably to make it easier to recognize who it is

They literally made S-Crocodile have the scar, but the weird thing is the glasses?

Why can't oda show doffy's face for once, ONCE IN A MORTAL LIFE man