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  • Nasolacrimal duct obstruction anatomy

    Adapted from an illustration by Christine Gralapp, MA, CMI.
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    Pediatric Ophth/Strabismus
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    Tears are directed to the upper and lower punctum. Negative pressure is created, drawing the tears into the sac, where they drain through the nasolacrimal duct and enter the nose through the valve of Hasner below the inferior turbinate (arrow).