Reflex of fluid through the opposite canaliculus during Jones testing indicates blockage at which site?

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Study for the NBEO Ocular Disease Part 1 Test. Use flashcards and multiple choice questions, each with hints and explanations, to prepare for your exam! Get ready for your success!

Multiple Choice

Reflex of fluid through the opposite canaliculus during Jones testing indicates blockage at which site?

Explanation:
Reflex of fluid through the opposite canaliculus during Jones testing indicates blockage in the canaliculus of the eye being tested. When fluorescein is instilled, a patent drainage path would carry fluid from the punctum through the canaliculus, into the lacrimal sac and onward. If the canaliculus on the tested side is blocked, the fluid cannot advance along that route, so pressure drives it back and out through the opposite canaliculus. This pattern localizes the obstruction to the upper or lower canaliculus itself rather than to the nasolacrimal duct or other structures.

Reflex of fluid through the opposite canaliculus during Jones testing indicates blockage in the canaliculus of the eye being tested. When fluorescein is instilled, a patent drainage path would carry fluid from the punctum through the canaliculus, into the lacrimal sac and onward. If the canaliculus on the tested side is blocked, the fluid cannot advance along that route, so pressure drives it back and out through the opposite canaliculus. This pattern localizes the obstruction to the upper or lower canaliculus itself rather than to the nasolacrimal duct or other structures.

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