This is clearly a case where the sole act of him sharpening his own perception of what glases do resulted in him getting better glases.

I work freelance as a colorist and re-recording mixer – both are professions which are highly based on perception. And it is certainly true: if you try to really go into the details of something, be it color, sound or anything else, it already helps a lot if you sharpen your senses to these things. I always say: you don't pay me for beeing able to use some software, you pay me for having developed my senses over years in a way that others didn't.