For the last year and a half, i have had really sore itchy, red eyes, it seems to get worse on the evenings, but it feels as though i have grit under my eyelids, and there is white liquid that comes from the outer corner of my eyes.also i cant stop blinking, its rellt annoying me. i have used conjunctiviits drops and tear drops from the pharmacy, but nothing helps them, i have been to the eye infirmary twice, and they have given me them drops i said above aswell, but they havent helped at all, its relly worrying what could the problem be?