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Comment by pen2l | Hacker News Reader

So uhm, I’m a male reporting in with my anecdata. I am just like your girlfriend.

Can’t tolerate extreme temperatures (especially cold), but have a fairly high tolerance for physical pain compared to what’s normal I think.

And I am INFAMOUS for needing sunglasses. Whenever I’m visiting my folks, they know it’s the thing I’ll complain about if I’ll be in the sun and my mom will usually have bought sunglasses just for me.

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Eye colour has a lot to do with how much light your retinas let in, iirc. Would this explain your sensitivity?

I'm not sure of a relationship there, but I recall reading reports for a long time that red-heads felt less pain than other people - as a red-head this amuses me, but I have no personal data to share.

Random source is random:

http://sciencenordic.com/redheads-feel-different-kind-pain

My dentist told me that people with red hair are less susceptible to the effects of novicane. I have red in my beard and always need a second injection when getting drilled. She said this is the cause.

I've heard this as well. I have blue eyes and extreme sensitivity to light, much moreso than my partner w/ brown eyes. I can't be outside without sunglasses for instance, and I've noticed polarized lens's are far more effective at reducing my pain point than normal tinted glasses. I also can't just flick on the lights in the morning when I wake up, I have to gradually introduce my eyes to light.

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