it's a very unscientific observation and whatnot, but you'll note in this video that the people that see the dress incorrectly are all either wearing glasses or of an advanced age, where some vision loss may be present.

you have to even wonder if being unable to see the correct colours of the dress might indicate you're at a higher risk for age-related vision loss. given that the colour is blue, i think that's actually likely, as it's common for blues to appear "washed out" for people that suffer from age related vision loss.

what's pissing me off about this is that it's being presented in this relativistic manner, as though either answer is equally correct. it's not. the colour exists. it's easily discernible. you can see it correctly or you can see it incorrectly. and, if you're seeing it incorrectly it indicates that your eyes are defective.

i still think the screen contrast is the dominant factor, globally - people tend to have their contrast very high, especially on their phones, so they can see things in the day as they're walking in sunlight. but, these videos with two people side to side seeing it differently don't indicate anything other than that there's a large percentage of the population with defective vision.