As a glasses wearer, I get very dry eyes after a couple of hours of cycling, to the extent that it makes the eyes irritable and subsequently makes computer use uncomfortable.
Maybe this would happen if I was not a wearer of glasses too, I wouldn't know!
Does anyone else here experience this, and if so how do you deal with it / prevent it?
A few possibilities;
If it's wind getting to your eyes, wear cycling glasses that block the wind better that your normal glasses (plus contacts). Precription lenses often don't work well in the curved shapes that are best for cycling, and are really bloody expensive either way, so I wear contacts and non prescription cycling glasses.
If you can swing it, get new glasses or cycling glasses that have transitions photochromic lenses. I find my normal glasses with this are very comfy to wear in all conditions cycling, and darken up even on winter days when you'd never consider wearing sunnies, showing that your eyes do need the protection.
Visit an optician and get them to take a look at your eyes, might be a minor eye infection like Blephartis, or might be something to manage with eye drops that'll keep your eyes moist longer.