I have a top 1% IQ, so lower than you I guess, and my pupils are also super big. I’m pretty sensitive to light, though not as much as you. I remember multiple people remarking on it to me during my school days, and my eye doctor has never had to dilate my pupils before examination which is a nice bonus.
If you lay your hands flat with each thumb pointed at the other hand, your left hand will form an “L” shape. That’s probably what they meant to say.
Edit: oh looooooool, I literally just didn’t get the joke