More than a third did not know which UV light their sunglasses should be blocking
What an odd question to ask people.
I do not know by heart which they
should be blocking. Once I study a product whether on buying it or not I dig into that kind of info and find out what I need to know. Since I found out that it does the right thing and bought it, I can forget about that kind of details. Because it is of no relevance any more, the product does what it should do without me knowing the details.
So for this research, if this question is asked like this to the reviewed, I would be the ignorant one. While I only wear the right sunglasses.
It is so important to ask non-subjective questions in an interview.
On the other hand, it is good to inform people about eye protection in general.