Because the spiritual is more "REAL" than the physical .
Things are actually the reverse of what our senses of perception tell us is real in relation to the physical.....
Because the physical only exists because the most high spiritual being commanded it to......so in a sense spiritual or the unseen always trumps the physical ......the third eye sees the unseen....that the two are blinded to......
So IMHO a spiritual third eye vision always trumps the physical....It is much easier to believe an understanding this way if you have ever had a vision experience because as someone who has I sware to you on my soul that when the Holy Spirit activates that third eye.....it is a fact the other two go blind and you see what has been determined for you to see.......
And you won't just shake it off or pull yourself out of it and just exit stage left or whatever until it is completed.....
In my own personal experience I didnt want it to complete and was begging for the Holy Spirit Father Abba not to withdraw......
And when in it what you see is more elaborate detailed and or defined clearly than anything you will ever discern with your other two eyes.....
For example this is what I would presume to say the reason for Saul-Pauls resulting blindness from beholding Glorious magnificance was.....
Luckily for myself I only beheld his hands doing a works.....so once I was returned to my physical I had no after effects.....I guess one might say Saul Paul was not completely removed because his escorts saw him thrashing about blindly.....
My physical sensations were limited to the flow of joy and gratitude out of my physical eyes and the sound of my voice calling out....
Even still I was not in my body could not feel it and the audible of a witness calling me back I was deafened to.
Untill I began slowly back into my body then their calling began to sound soft from a distance at first.
Once you experience such spiritual power then your view of the physical is permanently changed and your perception of reality is reversed because the unseen is your new reality and the physical becomes the illusion that is unreal.