Abstract
Absence of puncta is of interest because of its rarity and the various operative technics which have been devised for its correction. According to Ida Mann, 1 the sac and nasal duct are developed as a line of buried epithelium formed by the overlapping of the lateral nasal process by the maxillary process. The tucked-in epithelium separates from the surface and by budding from its upper end maps out the canaliculi and puncta. All the passages are at first blocked out in solid epithelium and do not canalize until just before birth. The passages do not develop, the epithelial buds pursue an abnormal course or the apparatus fails to canalize. Failure of canalization leads to congenital lacrimal obstruction and, since the epithelial plug invariably becomes infected during or just after birth, to congenital dacryocystitis. The two epithelial extensions which pass from the sac to enter the upper and lower lid
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
