I work for an eye doctor, and this happens more often than you would think. People get the glue bottle confused with the eye drops bottle, and it happens.

The doctor I work for keeps a bottle of fingernail polish remover handy at our office, just for such situations. It works wonderfully well to dissolve the glue. He has to be very careful with it so as not to damage the eye further, though (which has never happened to a patient in his care).

Sometimes there is damage to the person's cornea (clear area over the iris and pupil area) from the glue, but thankfully the cornea will usually heal with proper care. It can be extremely painful for the patient, though.