I am very very sorry to heard it. Have you get the tiny rock out of your eyes. If so, it won't cause any serious eye damages. But you may get scracthes on the eyes because of the tiny rock. You'd better see a doctor and have a eye check. Hope you will be OK soon.
In common, it won't cause blindness becaue your eyes get a tiny rock. But it may scracth your cornea. So, you'd better take your of your eyes. And try to remove the tiny rock from your eyes gently. Flusing your eyes with eyedrops may help the eyes.