Dust bead, grain of sand or eyelash in the eye?
If you've gotten some dirt, dust, or a grain of sand, or even an eyelash, maybe a simple trick that I myself learned as a child from my mum and, if necessary, still practice today:
Grasp the upper eyelid with two fingers on the eyelashes and pull over the lower part, blink and repeat if not successful. The fine hairs of the lower eyelid brush the foreign body out of the eye in most cases.
If unsuccessful, consult the ophthalmologist.
