What does the Jones test evaluate?

The Jones test is specifically designed to evaluate nasolacrimal patency, which refers to the unobstructed state of the ducts that transport tears from the eyes to the nasal cavity. During the procedure, a fluorescein dye is applied to the ocular surface, and its passage through the nasolacrimal system is monitored. If the dye appears in the nasal cavity, it indicates that the tear drainage system is functioning normally and that there is no obstruction.

In contrast, the other options address different aspects of ocular health. Corneal sensitivity evaluates the reaction of the cornea to stimuli, pupil response assesses the function of the iris and its reaction to light changes, and conjunctival health pertains to the condition of the conjunctiva (the tissue covering the inside of the eyelids and the white part of the eyeball). These tests focus on different ocular structures and functions, emphasizing why they are not related to the primary purpose of the Jones test.