I was born and raised in the countryside and lived in the same house until I was 18. When I was around 11 I developed severe hay fever out of nowhere. It's not

I was born and raised in the countryside and lived in the same house until I was 18. When I was around 11 I developed severe hay fever out of nowhere. It's not like I wasn't exposed to pollen before, as I was a typical country kid running around in fields and such. The doctor issued me the usual antihistamines, but they didn't really help so I just sucked it up every summer. When I was 17 I started wearing contact lenses - and after that no more hay fever. I thought at first the contact lenses were blocking the pollen from getting into my eyes, but I've now reverted back to almost always wearing glasses. 10 years later and no more hay fever. Go figure...