It is a very vague conception of your words of "like sandpaper", because there has no photos to check, so the only thing I would do is to guess. From your description of this symptom I guess, it is maybe the squamous blepharitis. There has some other symptom for you to check if it is true the disease. Has your eyes feel burning, and the eyelids swollen or itching? Has your root of eyelids squamous? Some of the blepharitis will be accompanied with the conjunctivitis. All in all, all the above words are guess. You really need go to doctor for the details check, and keep your personal hygiene of your eyes, because it really very subtle and delicate. Keep your hand away from your eyes; avoid rubbing it and getting it infection. Relax it after long time work and prevent it from allergey of food. Ok, hope you all the best soon.