Anecdotally from my own experience, there are far more school and college children wearing glasses these days.

In the past people who wore glasses were ridiculed in school. A little bit of nudge theory later.

It has now become a bit of a fashion to wear glasses even when not needed so it's difficult to assess the true extent of vision impairment from my end. No data.

The allergy issue is also tricky to assess.

With every generation since the 19th century, the number of children with allergies has 'seemingly' increased exponentially.

It may be the case that we have just got better at detecting allergies and creating treatments.

In the past. People with allergies just died we must assume without accurate data it's difficult to confirm or deny.

There is for sure another angle to this kind of research. Big pharma?

It does seem that we have more people with allergies today than when I was a kid.

Maybe it is at epidemic levels or maybe just a marketing ploy?

Vitamin D can be absorbed by just spending 10 minutes in the sun even in England in the winter.

Interesting piece. I'd like to see the data set and who sponsored the research.