So, pale skin is, fundamentally, an adaptation to living in low light conditions. Pros: reduce energy spent on producing melanin, increase vitamin D production. Cons: more vulnerable to sunburns and skin cancer.
Do populations with this sort of adaptation have an increased rate of other low light adaptations? Specifically, I'm thinking of vision in low light situations. Examples of possible adaptations: increased rod count in the retina (pro: better low light vision, con: worse bright light vision), or faster production/resetting of rhodopsin (pro: better low light vision, con: greater energy expenditure).