How a Scorpions eye would detect metal and other

 If i were some sort of modern scorpion guy and had some sort of eye that would detect things like metal, heres how it would work. In or a layer on the eye like a contact lens would have a very pressure plate type sensor, the after around a millimeter or more u would have a faint metal small ball like net that when u face metal would touch the contact which would be magnetized or have magnetic parts to it, thus the sensor would sync with the pulled back net into the metal as when u are facing metal it would create a force between both magnet throught the net and to the metal or other such things u are looking for, and then it would translate probably audibly to create another sense so it does not damage the eye, and for it to be visual u would need it to have both frequencies projected infront direction from the ears infront of the eyes creating a 3d point for ur third eye to see in 3d the object itself without the need of a screen.

Ect...