Just take aura lenses in two hands.
- From third person perspective aura lens are crossed.
- From third person perspective the GUI of aura lens is rendered, but in concept player must see aspects of blocks/entities/items only through lens glass.
- From first person perspective aura lens start Z-fighting.
Also, aura lens don`t give revealing when in off-hand. Its can be easy fixed by changing EquipmentSlotGroup.MAINHAND to EquipmentSlotGroup.HAND