Dryness of eye is caused by injury to facial nerve at:
Chorda tympani
Vertical segment
Tympanic segment
Geniculate ganglion
(d) Geniculate ganglion(Ref. Cummings, 6th ed., 2606)Whenever there is injury before or at the origin of the greater superficial petrosal nerve (i.e. before or at the Geniculate ganglion) which is responsible for lacrimation there will be dry eye on the same side.Tympanic segment, Vertical segment and Chorda tympani all are beyond the geniculate ganglion.
Facial Nerve And Its Disorders