Dried eyes while cycling

Went for a bike ride today. I've been on lots this year without problems, but this one was a bit different. Something about the particular temperature, humidity, and wind appears to have dried my eyes out. Signs weren't readable until much closer than usual. It was like I was 20/40. Now having gotten inside it's much better, but I think I'll be wearing glasses in colder dry weather like this in the future.

Just to confirm, I did a quick macuyver test on my left eye:
10pt: 80.6%
12pt: 100%

So not that much worse, but noticeably worse than yesterday. And that's after 15 minutes of my eyes being out of the wind.

4 months and a week Macguyver

Left Eye:
10pt: 96.6%
12pt: 96.6%

Right Eye:
10pt: 96.6%
12pt: 96.6%

That's right, everything is the same this time. I've been watching for degradation since it's expected to have a bit of pullback and thought I had noticed some, but I guess it's not noticeable enough yet. My eyes have been itchy for the last couple weeks, but that may just be spring allergies.