The other commenters are well meaning but don't really know what they're talking about. I have chronic dry eye from staring at screens too much (remember to blink!). My tear ducts have gotten overworked and started to produce thicker, gunkier, tears which blocked them and cause styes. I've lost a bunch of my tear ducts. Once they're gone they don't grow back.

These little mites eat the gunk my eyes produce and, when they get overpopulated, leave a ton of gunk on your eye. It's called blepharitis

https://my.clevelandclinic.org/health/diseases/demodex-blepharitis

I've had it so bad that I've had trouble opening my eyes in the morning. There's a relatively new eyedrop that clears them out. Combining that with hot dye compresses and lid scrubs have helped keep them under control and has drastically increased my eyelid health

I hope that helps answer your question