Eye Pain from wearing Glasses. Undergo?

I've had eye pain whenever I wear glasses for the past 12 years. I've tried wearing glasses consistently for long periods (including about 2 years continuously), but the pain never resolved. Because of this, I switched to contact lenses (last 10 years), which were generally comfortable and did not cause the same pain. However, over the last year, I've started experiencing eye irritation with contact lenses as well. It feels as though my eyes have become more sensitive to them, although I'm not sure whether this is due to changes in my eyes or the lenses themselves. My spectacle prescription has been checked and updated multiple times over the years, but the discomfort with glasses persists. What could be causing this, and what evaluations should I undergo?