There was one patient awaiting consultation in the ophthalmology department and whilst he was doing so, he also had to undergo a quantitative assessment of tear production. In other words, testing to see if his lacrimal glands produced enough lacrimal fluid. The action was taken because he was complaining of dryness in his eyes. The Schirmer method was used and the scores that result from taking the test actually represent the length of a paper strip that was crossed by the lacrimal fluid. Turns out, that was the reason his eyes felt dry- his tear production accounted for a low score.
Yet, that was not exactly the most interesting thing that came out of that consultation (and why I won't insist on that matter for now).
I learnt that while you can assess the quantity of tears secreted, you can also assess the lacrimal fluid in terms of