Biology, asked by theshaikharshad1224, 8 months ago

Congenital nasolacrimal duct obstruction

Answers

Answered by jithujilladi6

0

Answer:

Explanation:

Congenital nasolacrimal duct obstruction, or dacryostenosis, occurs when the lacrimal duct has failed to open at the time of birth, most often due to an imperforate membrane at the valve of Hasner.

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