This only makes sense.
If a tree falls in a forest, with no one nearby to hear, does it make a sound?
No. It makes a vibration.
Audible vibration, or visible radiation, is the objective reality. Hearing, or seeing, is the subjective interpretation.
No two people have absolutely identical hearing; no two people have absolutely identical seeing.
If you could go fine enough in analysis, the perception of either would be as unique as any other physical trait, like an earlobe or a fingerprint or a voiceprint.
The most obvious example of subjective variation with respect to eyesight would be color blindness.
“This is the great mystery of human vision...”
But it is, of course, no mystery to evolution, that patiently worked it out to perfection over the billions of years.
My father, an engineer, had told me when I was a kid that pretty much anything in the universe could be expressed mathematically.
The older I get the more I realize how right he was.