Examination of the Eyelids and Nasolacrimal Duct
The upper eyelid covers the superior margin of the cornea. A few millimeters of the sclera will be visible above the lower eyelid. The eyelids are in direct con-tact with the eyeball.
Stenosis of the nasolacrimal duct produces a pool of tears in the medialangle of the eye with lacrimation (epiphora). In inflammation of the lacrimalsac, pressure on the nasolacrimal sac frequently causes a reflux of mucus orpus from the inferior punctum. Patency of the nasolacrimal ductis tested byinstilling a 10% fluorescein solution in the conjunctival sac of the eye. If the dye is present in nasal mucus expelled into paper tissue after two minutes, the lacrimal duct is open.